Genesis 18:10
And he said, I will certainly return unto you according to the time of life; and, lo, Sarah your wife shall have a son. And Sarah heard in the tent door, which behind him.
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Context
8 And he took butter, and milk, and the calf which he had dressed, and set before them; and he stood by them under the tree, and they did eat.
9 And they said unto him, Where Sarah your wife? And he said, Behold, in the tent.
10 And he said, I will certainly return unto you according to the time of life; and, lo, Sarah your wife shall have a son. And Sarah heard in the tent door, which behind him.
11 Now Abraham and Sarah old well stricken in age; it ceased to be with Sarah after the manner of women.
12 Therefore Sarah laughed within herself, saying, After I am waxed old shall I have pleasure, my lord being old also?