Bible Book: Genesis
About 14 years after Ishamael’s birth, God appeared once more to Abram to establish a new covenant in which He stated that Abram’s wife Sarai would bear him an heir about the same time the following year. As part of this new covenant, God renamed Abram and Sarai – Abraham and Sarah and commanded every male in Abraham’s family and all of his male descendants to be circumcised.
Genesis 15 tells us of God’s appearance to Abram in a vision through which God reiterated His promise to bring forth an innumerable nation from Abram’s own son and to give Abram’s offspring all the land from the Nile to the Euphrates as their inheritance. In Genesis 15:6, we read that Abram believed God and his faith was credited by God to Abram as righteousness.