God calls Abraham and shapes the future of his family with this promise:
“‘Go from your country and your kindred and your father’s house to the land that I will show you. I will make of you a great nation, and I will bless you, and make your name great, so that you will be a blessing. I will bless those who bless you, and the one who curses you I will curse; and in you all the families of the earth shall be blessed.’” (Genesis 12:1-3).
Abraham leaves his home of Ur to go to Haran when God calls him. The Bible tells the story of his travels from Ur to Haran, through Canaan, into Egypt and back to Haran.
Abraham was married to Sarah, who was unable to have children. God promises to give the couple an heir, however after waiting many years for this promise to be fulfilled, Sarah tells Abraham to sleep with her servant girl, Hagar. Hagar conceives and has a son named Ishmael. Abraham and Sarah eventually have a son, who is named Isaac. Isaac is born when Abraham is 100 years old and Sarah is 90 years old. As a test of faith, God tells Abraham to offer his son Isaac as a burnt offering, and Abraham obeys God. However, at the last moment, God tells Abraham not to kill Isaac and gives him a ram to sacrifice instead. Abraham continues to walk with God, and God establishes his covenant with him. Abraham’s descendants are to be circumcised as a reminder of God's promises to Abraham.