Judges 11:29-40 says,
29Then the Spirit of the LORD came upon Jephthah, and he passed over Gilead, and Manasseh, and passed over Mizpeh of Gilead, and from Mizpeh of Gilead he passed over unto the children of Ammon.
30And Jephthah vowed a vow unto the LORD, and said, If thou shalt without fail deliver the children of Ammon into mine hands,
31Then it shall be, that whatsoever cometh forth of the doors of my house to meet me, when I return in peace from the children of Ammon, shall surely be the LORD'S, and I will offer it up for a burnt offering.
32So Jephthah passed over unto the children of Ammon to fight against them; and the LORD delivered them into his hands.
33And he smote them from Aroer, even till thou come to Minnith, even twenty cities, and unto the plain of the vineyards, with a very great slaughter. Thus the children of Ammon were subdued before the children of Israel.
34And Jephthah came to Mizpeh unto his house, and, behold, his daughter came out to meet him with timbrels and with dances: and she was his only child; beside her he had neither son nor daughter.
35And it came to pass, when he saw her, that he rent his clothes, and said, Alas, my daughter! thou hast brought me very low, and thou art one of them that trouble me: for I have opened my mouth unto the LORD, and I cannot go back.
36And she said unto him, My father, if thou hast opened thy mouth unto the LORD, do to me according to that which hath proceeded out of thy mouth; forasmuch as the LORD hath taken vengeance for thee of thine enemies, even of the children of Ammon.
37And she said unto her father, Let this thing be done for me: let me alone two months, that I may go up and down upon the mountains, and bewail my virginity, I and my fellows.
38And he said, Go. And he sent her away for two months: and she went with her companions, and bewailed her virginity upon the mountains.
39And it came to pass at the end of two months, that she returned unto her father, who did with her according to his vow which he had vowed: and she knew no man. And it was a custom in Israel,
40That the daughters of Israel went yearly to lament the daughter of Jephthah the Gileadite four days in a year.
An objective reading
Observe that verse 29 says that the spirit of the Lord came upon Jephthah, then immediately afterward in verse 30 Jephthah makes his vow. This suggests that God influenced Jephthah in making the vow.
It is then said in verse 32 that God delivered Jephthah's enemies into his hands, indicating that God accepted Jephthah's terms (which, as I said, were possibly influenced by God to begin with).
In verse 36, Jephthah's daughter gives no indication that her father's vow is invalid and that it should be nullified. In fact, she says that he must honor his vow.
Finally, in verse 39, Jephthah fulfills his vow. There is no indication that God is either pleased or displeased with this.
An apologist's reading (and what they overlook)
Generally, apologists ignore the points I raised about verses 29, 30, & 32 and simply defer to the last point I made (that God gives no indication that he is either pleased or displeased with the sacrifice).
While the Bible does not explicitly forbid every kind of human sacrifice (and how could it if it promotes Christ's sacrifice?), Deuteronomy 18:10 forbids the exact thing that Jephthah did: a burnt offering of one's son or daughter (note that verse 31 has Jephthah specifying that he will give a burnt offering).
Does Jephthah not know this? Does Jephthah's daughter not know this? Do none of her friends know this (note that she retreats with friends to the mountains in verses 37-38)? Are there no neighbors who discover Jephthah's plans in the two-month interim who know this? Why did God seem to arrange all of this if it is in direct violation of his edicts?
Also, why does the daughter's self-preservation instinct never prompt her actions? Why does she not seek the elders of her village? Do her actions seem reasonable? Is she supposed to honor her father and allow her father to commit this abominable act, or is she supposed to honor God above her father and rebuke him for this? If she is obeying her father with pure, yet ignorant, intentions, and if God does not want this to occur, why doesn't he make it clear to her, to Jephthah, or to both? It's unlikely that she had access to scriptures, so shouldn't God clarify the situation if a girl is obeying him incorrectly through no fault of her own?
Lastly, why does the author of Hebrews give Jephthah a "shout out" in the "Faith Hall of Fame"? Jephthah is casually mentioned in chapter 11 verse 32.
My reading
Many scholars view the book of Judges as a propaganda piece to push the idea of a king upon Israel. A common saying throughout the book is, "In those days there was no king in Israel: every man did that which was right in his own eyes."
I think the book of Judges is literally true about little to nothing. Judges 19 is a darker retelling of the story about Lot (Lot offered his daughters to a mob of rapists but did not actually give them; in Judges 19, the priest actually does give his concubine to a mob of rapists who raped her to death). The story of Jephthah is a darker retelling of the story about Abraham and Isaac: while Abraham, of course, did not end up killing his own son, Jephthah actually did kill his own daughter.
The reader was supposed to interpret this and connect the dots for himself: without a king, the nation of Israel heads into darkness.
29Then the Spirit of the LORD came upon Jephthah, and he passed over Gilead, and Manasseh, and passed over Mizpeh of Gilead, and from Mizpeh of Gilead he passed over unto the children of Ammon.
30And Jephthah vowed a vow unto the LORD, and said, If thou shalt without fail deliver the children of Ammon into mine hands,
31Then it shall be, that whatsoever cometh forth of the doors of my house to meet me, when I return in peace from the children of Ammon, shall surely be the LORD'S, and I will offer it up for a burnt offering.
32So Jephthah passed over unto the children of Ammon to fight against them; and the LORD delivered them into his hands.
33And he smote them from Aroer, even till thou come to Minnith, even twenty cities, and unto the plain of the vineyards, with a very great slaughter. Thus the children of Ammon were subdued before the children of Israel.
34And Jephthah came to Mizpeh unto his house, and, behold, his daughter came out to meet him with timbrels and with dances: and she was his only child; beside her he had neither son nor daughter.
35And it came to pass, when he saw her, that he rent his clothes, and said, Alas, my daughter! thou hast brought me very low, and thou art one of them that trouble me: for I have opened my mouth unto the LORD, and I cannot go back.
36And she said unto him, My father, if thou hast opened thy mouth unto the LORD, do to me according to that which hath proceeded out of thy mouth; forasmuch as the LORD hath taken vengeance for thee of thine enemies, even of the children of Ammon.
37And she said unto her father, Let this thing be done for me: let me alone two months, that I may go up and down upon the mountains, and bewail my virginity, I and my fellows.
38And he said, Go. And he sent her away for two months: and she went with her companions, and bewailed her virginity upon the mountains.
39And it came to pass at the end of two months, that she returned unto her father, who did with her according to his vow which he had vowed: and she knew no man. And it was a custom in Israel,
40That the daughters of Israel went yearly to lament the daughter of Jephthah the Gileadite four days in a year.
An objective reading
Observe that verse 29 says that the spirit of the Lord came upon Jephthah, then immediately afterward in verse 30 Jephthah makes his vow. This suggests that God influenced Jephthah in making the vow.
It is then said in verse 32 that God delivered Jephthah's enemies into his hands, indicating that God accepted Jephthah's terms (which, as I said, were possibly influenced by God to begin with).
In verse 36, Jephthah's daughter gives no indication that her father's vow is invalid and that it should be nullified. In fact, she says that he must honor his vow.
Finally, in verse 39, Jephthah fulfills his vow. There is no indication that God is either pleased or displeased with this.
An apologist's reading (and what they overlook)
Generally, apologists ignore the points I raised about verses 29, 30, & 32 and simply defer to the last point I made (that God gives no indication that he is either pleased or displeased with the sacrifice).
While the Bible does not explicitly forbid every kind of human sacrifice (and how could it if it promotes Christ's sacrifice?), Deuteronomy 18:10 forbids the exact thing that Jephthah did: a burnt offering of one's son or daughter (note that verse 31 has Jephthah specifying that he will give a burnt offering).
Does Jephthah not know this? Does Jephthah's daughter not know this? Do none of her friends know this (note that she retreats with friends to the mountains in verses 37-38)? Are there no neighbors who discover Jephthah's plans in the two-month interim who know this? Why did God seem to arrange all of this if it is in direct violation of his edicts?
Also, why does the daughter's self-preservation instinct never prompt her actions? Why does she not seek the elders of her village? Do her actions seem reasonable? Is she supposed to honor her father and allow her father to commit this abominable act, or is she supposed to honor God above her father and rebuke him for this? If she is obeying her father with pure, yet ignorant, intentions, and if God does not want this to occur, why doesn't he make it clear to her, to Jephthah, or to both? It's unlikely that she had access to scriptures, so shouldn't God clarify the situation if a girl is obeying him incorrectly through no fault of her own?
Lastly, why does the author of Hebrews give Jephthah a "shout out" in the "Faith Hall of Fame"? Jephthah is casually mentioned in chapter 11 verse 32.
My reading
Many scholars view the book of Judges as a propaganda piece to push the idea of a king upon Israel. A common saying throughout the book is, "In those days there was no king in Israel: every man did that which was right in his own eyes."
I think the book of Judges is literally true about little to nothing. Judges 19 is a darker retelling of the story about Lot (Lot offered his daughters to a mob of rapists but did not actually give them; in Judges 19, the priest actually does give his concubine to a mob of rapists who raped her to death). The story of Jephthah is a darker retelling of the story about Abraham and Isaac: while Abraham, of course, did not end up killing his own son, Jephthah actually did kill his own daughter.
The reader was supposed to interpret this and connect the dots for himself: without a king, the nation of Israel heads into darkness.