Genesis 18:12

8 Then Abraham brought curds and milk and the calf that had been prepared, and he set them before the men and stood by them under the tree as they ate.

9 “Where is your wife Sarah?” they asked. “There, in the tent,” he replied.

10 Then the LORD said, “I will surely return to you at this time next year, and your wife Sarah will have a son!” Now Sarah was behind him, listening at the entrance to the tent.

11 And Abraham and Sarah were already old and well along in years; Sarah had passed the age of childbearing.

12 So she laughed to herself, saying, “After I am worn out and my master is old, will I now have this pleasure?”

13 And the LORD asked Abraham, “Why did Sarah laugh and say, ‘Can I really bear a child when I am old?’

14 Is anything too difficult for the LORD? At the appointed time I will return to you—in about a year—and Sarah will have a son.”

15 But Sarah was afraid, so she denied it and said, “I did not laugh.” “No,” replied the LORD, “but you did laugh.”

16 When the men got up to leave, they looked out over Sodom, and Abraham walked along with them to see them off.

Read all of Genesis 18