God raised up His servant Jesus the Messiah (described in Isaiah 53) to fulfill the promises God made to the patriarchs Abraham, Isaac and Jacob. This fulfillment comes through Jesus, through whom Israel and the nations receive the blessing of atonement for sins.
First, God would make a great people from Abraham. The second promise was of the land itself. The third promise was that through Abraham and his descendants, all the nations of the world would be blessed.
Genesis 12:3 I will bless those who bless you, and him who dishonors you I will curse, and in you all the families of the earth shall be blessed.
God promised Abraham that his ligneage would bring blessing to the whole earth. This was a promise also of protection against curses.
Genesis 22:18 and in your offspring shall all the nations of the earth be blessed, because you have obeyed my voice
Abraham's obedience is the origin of the blessing promised to "his offspring" this can be interpreted as Israel but also as an indication that the Messiah would be his offspring.
The New Testament description
Matthew 1:1 The book of the genealogy of Jesus Christ, the son of David, the son of Abraham
The first book of the New Testatment starts with the description of Jesus Christ's genealogy and it goes as back as Abraham.
Romans 9:5 To them belong the patriarchs, and from their race, according to the flesh, is the Christ, who is God over all, blessed forever. Amen.
Paul didn't mention Abraham but uses the word "Patriarch" wish by association includes Abraham.
The Blessing of God
When God made the promise to Abraham, because He could swear by no one greater, He swore by Himself, saying,
Hebrews 6:13–15Surely blessing I will bless you, and multiplying I will multiply you.” And so, after he had patiently endured, he obtained the promise.
Our God guides our steps and goes ahead of us, when He walks with us through hard times and brings us to good and pleasant places.
God blesses us with His constant presence. Whatever trials you face, nothing can separate you from His love. Whatever twists in the road, nothing can interfere with His sovereign power and goodness. Whatever missteps you take, He can redeem. Whatever hurts you experience, He can heal your soul and revive your spirit.
The Messiah would come from the line of Abraham