Genesis 18:8-10 World English Bible (WEB)
8 He took butter, milk, and the calf which he had dressed, and set it before them. He stood by them under the tree, and they ate.
9 They asked him, “Where is Sarah, your wife?”
He said, “See, in the tent.”
10 He said, “I will certainly return to you when the season comes round. Behold, Sarah your wife will have a son.”
Sarah heard in the tent door, which was behind him.