This is a summary of an article taken from www.wikipedia.com, about God’s covenant with Abraham.

The Abrahamic covenant is found in Genesis chapters 12, 15, and 17. In contrast with the covenants made with Adam or Noah which were universal in scope, this covenant was with a particular people. Abraham is promised a seed and a land, although he would not see its fruition within his own lifetime. The Book of Hebrews explains that he was looking to a better and heavenly land, a city with foundations, whose builder and architect is God (11:8-16). The Apostle Paul writes that the promised seed refers in particular to Christ (Galatians 3:16).

The Abrahamic covenant is

  1. Exclusive: It is only for Abraham and his (spiritual) descendants.Genesis 17:7
  2. Everlasting: It is not replaced by any later covenant. Genesis 17:7
  3. Accepted by faith, not works: “Abram believed the LORD, and he credited it to him as righteousness. “Genesis 15:6
  4. The external sign of entering into the Abrahamic covenant was circumcision. Genesis 17:10, but it has to be matched by an internal change, the circumcision of the heart. Jeremiah 4:4
  5. According to Paul, since the Abrahamic covenant is eternal, the followers of Christ are “children of Abraham” and therefore part of this covenant through faith. “Understand, then, that those who have faith are children of Abraham.” Galatians 3:7
  6. Paul makes it clear that baptism is the external sign of faith in Christ (“…you were baptized into Christ…”), and that through faith in Christ the believer is part of the Abrahamic covenant (“Abraham’s seed”). This provides the basis for the doctrine that baptism is the New Testament sign of God’s covenant with Abraham.

Galatians 3:26 “So in Christ Jesus you are all children of God through faith, 27 for all of you who were baptized into Christ have clothed yourselves with Christ. 28 There is neither Jew nor Gentile, neither slave nor free, nor is there male and female, for you are all one in Christ Jesus. 29 If you belong to Christ, then you are Abraham’s seed, and heirs according to the promise.”