Uthman ibn Abi Shaybah and Ishaq ibn Ibrahim narrated to us, both from Jarir. Uthman said: Jarir narrated to us, from al-A'mash, from Abu Wa'il, from 'Amr ibn Shurahbil, who said: 'Abdullah said: A man said, "O Messenger of Allah, which sin is greatest before Allah?" He said: "That you call upon a rival to Allah while He created you." He said: "Then which?" He said: "That you kill your child for fear that he will eat with you." He said: "Then which?" He said: "That you commit adultery with your neighbor's wife." Then Allah, Mighty and Majestic, revealed in confirmation of this: "And those who do not invoke with Allah another deity and do not kill the soul which Allah has forbidden [to be killed] except by [legal] right and do not commit unlawful sexual intercourse. And whoever should do that will meet a penalty."