Jesus In The Old Testament: The Seed of Abraham

In Genesis 12:2-3 we read the words of the covenant that God made with Abraham - known as the Abrianic Covenant. These are God's words of encouragement, promise, and blessing given to Abraham; “I will make you into a great nation,and I will bless you; I will make your name great, and you will be a blessing. I will bless those who bless you,  and whoever curses you I will curse; and all peoples on earth will be blessed through you.”

From this covenant - and these verses - we read that through Abraham's seed - his offspring - all nations on the earth will be blessed.

In Acts 3:25-26 Peter speaks these words to the Israelite people; "And you are heirs of the prophets and of the covenant God made with your fathers. He said to Abraham, ‘Through your offspring all peoples on earth will be blessed.’ When God raised up his servant, he sent him first to you to bless you by turning each of you from your wicked ways."

This servant of God's is Jesus Christ, God's Son. Jesus was sent first to the Israelite people - to the Jews - because of God's covenant given to Abraham some 2,100 years before the birth of Jesus in Bethlehem.  You can read the genealogy from Abraham to Jesus in Matthew 1.