Genesis 21:2

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

Sarah became pregnant and bore a son to Abraham in his old age, at the appointed time God had told him.

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

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

Sarah became pregnant and bore a son to Abraham in his old age, at the very time God had promised him.

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

She became pregnant, and she gave birth to a son for Abraham in his old age. This happened at just the time God had said it would.

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