4 And Abraham circumcised his son Isaac when he was eight days old, as God had commanded him.
5 Abraham was a hundred years old when Isaac was born.
6 And Sarah said, God has made me to laugh; all who hear will laugh with me.
7 And she said, Who would have said to Abraham that Sarah would nurse children at the breast? For I have borne him a son in his old age! [Heb. 11:12.]
8 And the child grew and was weaned, and Abraham made a great feast the same day that Isaac was weaned.
9 Now Sarah saw the son of Hagar the Egyptian, whom she had borne to Abraham, mocking [Isaac].
10 Therefore she said to Abraham, Cast out this bondwoman and her son, for the son of this bondwoman shall not be an heir with my son Isaac. [Gal. 4:28-31.]