It has been a peculiar thing to notice the Lord’s response to Sarah’s laugh in comparison to when Abraham laughed. In Genesis 17, the Lord told Abraham he would have a child in about a year’s time; Abraham did not understand, laughed, and prayed for Ishmael. The Lord corrected Abraham’s knowledge, but gave no rebuke to his laugh. In Genesis 18, perhaps a little while later, the Lord visit Abraham and repeats the same promise. Sarah heard and laughed (from disbelief). The Lord rebuked her. Why the difference in response? Abraham’s doubt was corrected by the Lord on that particular occasion. No doubt, Abraham told Sarah the news. It’s likely Sarah had her doubts when her husband told her. Now, when the Lord told her, her doubts were without warrant.