10 The Lord said, "I will surely return to you in the spring, 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 age; it had ceased to be with Sarah after the manner of women. 12 So Sarah laughed to herself, saying, "After I have grown old, and my husband is old, shall I have pleasure?" 13 The Lord said to Abraham, "Why did Sarah laugh, and say, 'Shall I indeed bear a child, now that I am old?' 14 Is anything too hard for the Lord? At the appointed time I will return to you, in the spring, and Sarah shall have a son." 15 But Sarah denied, saying, "I did not laugh"; for she was afraid. He said, "No, but you did laugh."

Matthew Henry's Commentary on Genesis 18:10-15

Commentary on Genesis 18:9-15

(Read Genesis 18:9-15)

Where is Sarah thy wife? was asked. Note the answer, In the tent. Just at hand, in her proper place, occupied in her household concerns. There is nothing got by gadding. Those are most likely to receive comfort from God and his promises, who are in their proper place, and in the way of their duty, 17; but He who searches the heart, saw that the one sprung from unbelief, and the other from faith. She denied that she had laughed. One sin commonly brings in another, and it is not likely we shall strictly keep to truth, when we question the Divine truth. But whom the Lord loves he will rebuke, convict, silence, and bring to repentance, and if they sin before him.