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, “There, in the tent.”
10 He said, “I will certainly return to you at about this time next year; and behold, Sarah your wife will have a son.”
Sarah heard in the tent door, which was behind him.