Genesis 21:6 WBT

⁴  And Abraham circumcised his son Isaac, being eight days old, as God had commanded him.

⁵  And Abraham was a hundred years old, when his son Isaac was born to him.

⁶  And Sarah said, God hath made me to laugh, [so that] all that hear will laugh with me.

⁷  And she said, Who would have said to Abraham, that Sarah shall nurse children? for I have borne him a son in his old age.

⁸  And the child grew, and was weaned: and Abraham made a great feast the day that Isaac was weaned.