Genesis 21:2

For Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him.
— Genesis 21:2, King James Version

In other translations

World English Bible (WEB)

Sarah conceived, and bore Abraham a son in his old age, at the set time of which God had spoken to him.

American Standard Version (ASV)

And Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him.

Young's Literal Translation (YLT)

and Sarah conceiveth, and beareth a son to Abraham, to his old age, at the appointed time that God hath spoken of with him;