Now Abraham and Sarah were old, well advanced in age; and Sarah had passed the age of childbearing. Therefore Sarah laughed within herself. Genesis 18:11-12
Sarah had just overheard Abraham being told again that his wife would bear him a son. It was humanly impossible for Abraham and Sarah to have a child. Although firm believers in God, this promise was more than they could take in.
Their reaction to the promise of God was quite [...]