Genesis 17:17; Genesis 18:10-12

Genesis 17:17

17 Then Abraham fell on his face and laughed and said to himself, "Shall a child be born to a man who is a hundred years old? Shall Sarah, who is ninety years old, bear a child?"

Genesis 18:10-12

10 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.

11 Now Abraham and Sarah were old, advanced in years. The way of women had ceased to be with Sarah.

12 So Sarah laughed to herself, saying, "After I am worn out, and my lord is old, shall I have pleasure?"