HannibalFlavius said in post 32:
17Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfill.
Matthew 5:17-18 means that Jesus came the first time not to abolish the prophecies in the Mosaic law and the Old Testament prophets regarding the Christ's first coming, but to fulfill all those prophecies (Luke 24:44-48; e.g. Acts 3:22-26, Isaiah 53). Matthew 5:17-18 can't mean that Jesus came not to abolish the letter of the commandments of the Old Covenant Mosaic law, for he did come to do that, on the Cross (Ephesians 2:15-16, Colossians 2:14-17, Romans 7:6; 2 Corinthians 3:6-18, Hebrews 7:18-19). Also, Matthew 5:17-18 can't mean that Jesus came to fulfill the letter of all the Old Covenant Mosaic law's commandments, for he couldn't possibly have done that. For example, some of those commandments applied only to women after childbirth (Leviticus 12:4-8), or to wives suspected of adultery by their husbands (Numbers 5:19-31).
As the Christ (Matthew 5:17, Luke 24:44-46), the mediator of the New Covenant (Matthew 26:28, Hebrews 12:24, Hebrews 7:22, Hebrews 8:6-9), Jesus had the divine authority to contradict the letter of the Old Covenant Mosaic law's commandments and replace them with his own, even better, New Covenant commandments (Matthew 5:38-44, Matthew 19:7-9, John 8:5-7), such as those he gave in the Sermon on the Mount (Matthew 5:19 to 7:29) and in the epistles of Paul the apostle (1 Corinthians 14:37; 1 Thessalonians 4:2). And as the Christ, Jesus had the divine authority to allow his disciples to break the letter of the Old Covenant Mosaic law's commandments (Matthew 12:1-8).
HannibalFlavius said in post 32:
18For truly I say to you, Till heaven and earth pass, one stroke or one pronunciation mark shall in no wise pass from the law, till all be fulfilled.
Matthew 5:18 doesn't mean that heaven and earth have to pass away before the letter of the Old Covenant Mosaic law's commandments can be abolished, but that Jesus had to fulfill the Old Testament prophecies regarding the Christ's first coming (Luke 24:44-46; e.g. Acts 3:22-26, Isaiah 53), before he could abolish the letter of the Old Covenant Mosaic law's commandments on the Cross (Ephesians 2:15-16, Colossians 2:14-17, Romans 7:6; 2 Corinthians 3:6-18, Hebrews 7:18-19).
HannibalFlavius said in post 32:
19Whoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whoever shall do and teach them, the same shall be called great in the kingdom of heaven.
Matthew 5:19-20 refers to the New Covenant/New Testament commandments/sayings (Matthew 5:19, Matthew 7:24-29) which Jesus, as the Christ (Matthew 5:17b, Luke 24:44-46), was just about to give in the Sermon on the Mount (Matthew 5:19 to 7:29), and which New Covenant commandments "exceed in righteousness" (Matthew 5:20 to 7:29) the (now) abolished letter of the Old Covenant Mosaic law's commandments (Ephesians 2:15-16, Colossians 2:14-17, Romans 7:6; 2 Corinthians 3:6-18, Hebrews 7:18-19).
HannibalFlavius said in post 32:
Then Jesus explains how he makes the law harder to keep, and says we better keep it better than the Pharisees.
Jesus shows in the Sermon on the Mount how his New Covenant, Christian commandments are stricter than the letter of the commandments of the Old Covenant Mosaic law. For the letter of the Old Covenant Mosaic law forbade murder (Matthew 5:21, Exodus 20:13), whereas Jesus' New Covenant law forbids even calling people names (Matthew 5:22). And the letter of the Old Covenant Mosaic law forbade adultery (Matthew 5:27, Exodus 20:14), whereas Jesus' New Covenant law forbids even looking at another woman with lust (Matthew 5:28). And the letter of the Old Covenant Mosaic law permitted divorce and remarriage (Matthew 5:31, Deuteronomy 24:1-2), whereas Jesus' New Covenant law forbids it (Matthew 5:32, Mark 10:11-12, Luke 16:18), except for a single exemption granted only to husbands who discover that their newlywed wife isn't a virgin, but had committed fornication (Matthew 19:9).
Jesus also shows in the Sermon on the Mount that while his New Covenant, Christian law is stricter than the letter of the Old Covenant Mosaic law, at the same time it's also more merciful. For the letter of the Old Covenant Mosaic law required taking an eye for an eye (Matthew 5:38, Deuteronomy 19:21), whereas Jesus' New Covenant law requires turning the other cheek (Matthew 5:39). And the letter of the Old Covenant Mosaic law required hatred for one's enemies (Matthew 5:43, Deuteronomy 23:6), whereas Jesus' New Covenant law requires love for one's enemies (Matthew 5:44). And the letter of the Old Covenant Mosaic law, the ministration of death (2 Corinthians 3:7), required, for example, that adulterers be put to death (Leviticus 20:10), whereas Jesus showed mercy to the woman caught in adultery (John 8:4-11). And, for another example, the letter of the Old Covenant Mosaic law required that anyone who does any work on the sabbath is to be put to death (Exodus 31:14, Numbers 15:32-36), whereas Jesus allowed his disciples to work on the sabbath and said they were guiltless (Matthew 12:1-8), just as Jesus himself worked on the sabbath (John 5:17-18).
So in obeying Jesus' New Covenant commandments (Matthew 5:19 to 7:29, John 14:15; 1 Corinthians 14:37), believers, whether Jews or Gentiles, are both more merciful and loving, and they also exceed in righteousness those who try to keep the abolished letter of the Old Covenant Mosaic law (Matthew 5:20-48, Ephesians 2:15-16, Colossians 2:14-17, Romans 7:6; 2 Corinthians 3:6-18, Hebrews 7:18-19).
HannibalFlavius said in post 32:
Iniquity and sin is breaking any of the commandments.
Iniquity and sin isn't breaking any of the letter of the commandments of the Old Covenant Mosaic law. For on Jesus' cross, for both Jews and Gentiles (John 11:51-52), of all times, the letter of the Old Covenant Mosaic law was abolished (Ephesians 2:15-16, Colossians 2:14-17; 2 Corinthians 3:6-18), disannulled (Hebrews 7:18), rendered obsolete (Hebrews 8:13, Galatians 3:2-25, Galatians 4:21 to 5:8), taken away and replaced (Hebrews 10:9) by the better hope (Hebrews 7:19), the better covenant (Hebrews 7:22, Hebrews 8:6-12), the 2nd covenant (Hebrews 8:7, Hebrews 10:9), of Jesus' New Covenant law (Galatians 6:2, John 1:17, Matthew 26:28, Hebrews 12:24, Hebrews 9:15), so that the law was changed (Hebrews 7:12).
All believers, both Jews and Gentles, of all times, are delivered from the letter of the Old Covenant Mosaic law and shouldn't keep it (Romans 7:6; 2 Corinthians 3:6-18, Galatians 2:11-21) or have any desire to keep it (Galatians 4:21 to 5:8, Galatians 3:2-25). Believers keep the spirit of the Old Covenant Mosaic law (Romans 7:6) by loving others (Galatians 5:14, Romans 13:8-10), by doing to others as they would have others do to them (Matthew 7:12).
The New Covenant is a new law (Hebrews 7:12,18,19, Hebrews 10:1-23), consisting of Jesus' New Testament commandments (John 14:15), such as those he gave in the Sermon on the Mount (Matthew 5:19 to 7:29) and in the epistles of Paul the apostle (1 Corinthians 14:37). These commandments exceed in righteousness the abolished letter of the Old Covenant Mosaic law (Matthew 5:20-48). So there's no reason why any believer should ever want to go back under the letter of the Old Covenant Mosaic law (Galatians 3:2 to 5:26). It was just a temporary schoolmaster (Galatians 3:24-25), a temporary shadow (Colossians 2:16-17), which God set up because of sins long after he'd set up the original promise of the Abrahamic Covenant, and long before he brought that promise to fulfillment in Jesus' New Covenant (Galatians 3:16-29, Matthew 26:28).
The letter of the Old Covenant Mosaic law has been made obsolete by the New Covenant (Hebrews 8:13). For example, the letter of the Old Covenant Mosaic law required an Aaronic priesthood (Exodus 30:30), whereas the New Covenant replaced the Aaronic priesthood with the Melchisedechian priesthood (Hebrews 7:11-28). Also, the letter of the Old Covenant Mosaic law required animal sacrifices (e.g. Leviticus 23:19), whereas the New Covenant replaced those with the one-time sacrifice of Jesus (Hebrews 10).
The letter of the Old Covenant Mosaic law is the Hagar to the New Covenant's Sarah (Galatians 4:22-25), so that those people, whether Jews or Gentiles, who try to keep the letter of the Old Covenant Mosaic law are like Ishmael, while those people, whether Jews or Gentiles, who keep the New Covenant are like Isaac (Galatians 4:22-31).
The letter of the Old Covenant Mosaic law (including the letter of the 10 commandments), written and engraven in stones (2 Corinthians 3:7, Deuteronomy 4:13, Deuteronomy 27:8), was the ministration of death and condemnation (2 Corinthians 3:7,9). For example, see Leviticus 20:10, Exodus 31:14, and Numbers 15:32-36; and contrast these with the New Covenant's John 8:4-11 and Matthew 12:1-8. The letter of the Old Covenant Mosaic law has been done away (2 Corinthians 3:11), abolished (2 Corinthians 3:13b). But it's still able to spiritually blind some people as with a veil from beholding Jesus (2 Corinthians 3:14-16), whereas the New Covenant is the ministration of the spirit and righteousness (2 Corinthians 3:6,8,9b), which remains (2 Corinthians 3:11b), and which permits believers to remove the veil and to behold Jesus (2 Corinthians 3:16-18, Mark 15:38, Hebrews 7:18-19, Ephesians 2:15-18, Colossians 2:14-17).
But a mistaken spirit of Pharisaism can still sometimes deceive even Christians into thinking that they must keep the letter of the Old Covenant Mosaic law in order to be saved (Acts 15:1,5), or in order to become perfect (Galatians 3:2 to 5:26). This is a false, cursed gospel (Galatians 1:6-9). For if any believers are keeping any part of the letter of the Old Covenant Mosaic law, thinking that they must do so in order to be saved, or in order to become perfect, then Jesus will profit them nothing; they have fallen from grace (Galatians 5:2-8).