4 When his son Isaac was eight days old, Abraham circumcised him just as God had commanded him to do.
5 (Now Abraham was a hundred years old when his son Isaac was born to him.)
6 Sarah said, “God has made me laugh. Everyone who hears about this will laugh with me.”
7 She went on to say, “Who would have said to Abraham that Sarah would nurse children? Yet I have given birth to a son for him in his old age!”
8 The child grew and was weaned. Abraham prepared a great feast on the day that Isaac was weaned.
9 But Sarah noticed the son of Hagar the Egyptian – the son whom Hagar had borne to Abraham – mocking.
10 So she said to Abraham, “Banish that slave woman and her son, for the son of that slave woman will not be an heir along with my son Isaac!”