Targum Jonathan on Genesis
And one of them said, Returning I will return to thee in the coming year; and you shall be revived, and, behold, Sarah thy wife shall have a son. And Sarah was hearkening at the door of the tent, and Ishmael stood behind her, and marked what the Angel said.
Targum Jerusalem
And He said, Returning I will return to thee at that time, to revive you, and, behold, Sarah thy wife shall have a male child. And Sarah was hearkening at the door of the tent, and Ishmael stood behind her.