Genesis 18:6, 9-10

And Abraham went quickly into the tent to Sarah and said, “Quick! Three seahs of fine flour! Knead it, and make cakes.”

They said to him, “Where is Sarah your wife?” And he said, “She is in the tent.” The LORD said, “I will surely return to you about this time next year, and Sarah your wife shall have a son.” And Sarah was listening at the tent door behind him.