Leslie M. Grant · Comments on the Book of Genesis

Sarah did not again show her disbelief, but she did deny that she had laughed. She may have meant she did not laugh audibly, but the Lord insisted, "No, but you did laugh" (v.15). The Lord had the last word, and no doubt this occasion was the turning point for Sarah; for we read in Hebrews 11:11, "By faith Sarah herself received strength to conceive seed, and she bore a child when she was past age, because she judged Him faithful who had promised." Her unbelief was changed into genuine faith through the plain word of God given to her, and that faith bore fruit. To take deeply to heart the truth of God's word is the very essence of faith. As to this same occasion, Abraham's faith is commended in Romans 4:19-21.