Jesus Christ is also called Immanuel. In the OT the problem of God’s people due to their sins and the magnitude of the promises of God necessitated that God come himself to deliver on the promises made. God does come in Jesus Christ.
Read Matthew 1:18-25
Jesus Christ is called the Son of Abraham. He is the source of the blessings of justification and the Spirit and he grants these blessings to people in all nations. Not all people in all nations but only those who share the faith of Abraham and trust in Jesus Christ for their salvation.
Read Matthew 1:1-17