Genesis 18:10

Then the LORD said, 'I will surely return to you about this time next year, and Sarah your wife will have a son.' Now Sarah was listening at the entrance to the tent, which was behind him.

(New International Version)

He said, 'I will surely return to you at this time next year; and behold, Sarah your wife will have a son.' And Sarah was listening at the tent door, which was behind him.

(New American Standard Bible)

And he said, I will certainly return unto thee according to the time of life; and, lo, Sarah thy wife shall have a son. And Sarah heard it in the tent door, which was behind him.

(King James Version)