Chp. 18 verses 9 - 25: The angel/arab blesses Sara with a son and she laughs. Hashem tells Avraham that he will have a son, and questions Sara's laughter. Avraham confronts her about her laughter and she denies it. The guests leave and Hashem appears to Avraham to inform him of the destruction of Sodom and its inhabitants. Avraham begins his plea for the cities.