How can he be His only begotten son when Israel is the first born son?
The reply Jesus gave to your question, is in like a question in reply, as follows.....
Since David called the Messiah 'my Lord,' how can the Messiah be his son?
Let me rephrase your question in the appropriate way....
Since God calls the Messiah his Son, how can Jacob/Israel be the first born?
Samuel prophesies about the Messiah to come.....
“ ‘The Lord declares to you that the Lord himself will establish a house for you: When your days are over and you rest with your ancestors,
I will raise up your offspring to succeed you, your own flesh and blood, and I will establish his kingdom. He is the one who will build a house for my Name, and I will establish the throne of his kingdom forever.
I will be his father, and he will be my son.
The head of God's house is his firstborn.
Chronicles as second witness also reiterates the same prophetic message.....
“ ‘I declare to you that the Lord will build a house for you: When your days are over and you go to be with your ancestors, I will raise up your offspring to succeed you, one of your own sons, and I will establish his kingdom. He is the one who will build a house for me, and I will establish his throne forever.
I will be his father, and he will be my son.
I will never take my love away from him, as I took it away from your predecessor. I will set him over my house and my kingdom forever; his throne will be established forever.’ ”
Who is the Messiah's predecessor as first born to the house of God?
The Man Jacob who was called Israel, right?
Well in chronicles your oracles state in the most explicit way known to Judaism, through chronicles of Israel and its kings and rulers.
God, through your oracles is dictating to you a commandment and it is that God's WILL is to take away his love of his firstborn Jacob/Israel and to place it on his Son the Messiah, the SEED OF PROMISE.
Ask me your question again please......
How can he be His only begotten son when Jacob/Israel is the first born son?
Because Jacob/Israel his first born, is no longer his born, because the Messiah has been declared God's first born forever.
Jesus Christ is the Messiah, from the lineage of David and is therefore the 1st born of God, making him Israel forever, by replacing Jacob, who was once called Israel, but no longer.
Do you really believe that God has allowed so many nations to be deceived to follow Jesus the Messiah?
Messianic prophecies are fulfilled in the personhood of Jesus Christ of Nazareth.
Evidence is that God has shown you and your fellows 2000 years of
no house (no Temple).
So, please tell me if 2000 years of no house, is enough evidence for you and your fellows to believe what the entire nations of the world believe that Jesus is the Christ, who fulfilled all Jewish Messianic prophecies of building a house not made by human hands or human might.
At least, please do consult with your Tanak, rather than the 20 versions of 20 rabbis who claim a 2000 years of Israel with no house (no Temple),
how could that even be possible? This is proof positive for you, like taking a blood test and learning to accept the truth in the matter, no matter how much it grieves you and others to admit it.
Zechariah your Jewish oracle states....
"This is the word of the LORD to Zerubbabel:
'Not by might nor by power, but by my Spirit,' says the LORD Almighty.
The hands of Zerubbabel have laid the foundation of this temple; his hands will also complete it."
Israel is the first born who is the one to prophetically build God's house and for 2000 years, according to you and your significant fellows, God has given you no house. Sorry but that is the truth in this matter.
I am a Ninvite and I inform you, that God has never been without a house and without a nation, in fact God highlighted to all that he will bring the Messiah, in the symbolic depiction of Jospeh, to cloth him with the multi coloured coat, pointing to ruling all nations with an iron rod.
Do you believe that the Messiah uses physical force to subjugate his subjects?
Absolutely not!
Jesus Christ for the last 2000 years and counting, has won the hearts and minds of all people's of all nation, symbolising Joseph's multicoloured coat, through his Cross.
Does this offend you, when historical truth points to Jesus Christ as the firstborn of God and the forever Israel of God?
What does that make me as a Ninvite?
Jonah, who is sent to the Jews without a house, for the better part of 2000 years.
Jesus said.....
The men of Nineveh will stand up at the judgment with this generation and condemn it; for they repented at the preaching of Jonah, and now someone (The Messiah) greater than Jonah is here.
Why are we here, if I am not the Jonah to inform you that God replaced Jacob as the first born of God, because the Messiah was always destined to be the first born, that is in permanently ruling God's house. The House that has never ever been desolate for the last 2000 years.
Where have you and your fellows been hiding. Come out and join us, within God's house that Jesus has ruled and will rule forever.
I will put you and your significant fellows on top of my head, as the Semitic saying goes, so be our welcomed guests to carry the banner for the house of Israel. You are all invited to come and join us to make the highway of God with us, in the last hours of humanity.
In that day there will be a highway from Egypt to Assyria. The Egyptians and Assyrians will worship together. In that day Israel will be the third, along with Egypt and Assyria, a blessing on the earth. The Lord Almighty will bless them, saying, “Blessed be Egypt my people,
Assyria my handiwork, and Israel my inheritance.”