The Birth of Isaac
21 1 Now the Lord was gracious to Sarah as he had said, and the Lord did for Sarah what he had promised. 2 Sarah became pregnant and bore a son to Abraham in his old age, at the very time God had promised him. 3 Abraham gave the name Isaac to the son Sarah bore him. 4 When his son Isaac was eight days old, Abraham circumcised him, as God commanded him. 5 Abraham was a hundred years old when his son Isaac was born to him. 6 Sarah said, "God has brought me laughter, and everyone who hears about this will laugh with me." 7 And she added, "Who would have said to Abraham that Sarah would nurse children? Yet I have borne him a son in his old age."
Hagar and Ishmael Sent Away
8 The child grew and was weaned, and on the day Isaac was weaned Abraham held a great feast.
9 But Sarah saw that the son whom Hagar the Egyptian had borne to Abraham was mocking, 10 and she said to Abraham, "Get rid of that slave woman and her son, for that woman's son will never share in the inheritance with my son Isaac." 11 The matter distressed Abraham greatly because it concerned his son. 12 But God said to him, "Do not be so distressed about the boy and your slave woman. Listen to whatever Sarah tells you, because it is through Isaac that your offspring will be reckoned. 13 I will make the son of the slave into a nation also, because he is your offspring."
21:3 "Isaac" means "he laughs."
21:12 Or "seed"