Qutaybah ibn Sa'id narrated to us: Layth narrated to us, from Ibn al-Had, from Sa'd ibn Ibrahim, from Humayd ibn 'Abd al-Rahman, from 'Abdullah ibn 'Amr ibn al-'As, that the Messenger of Allah, peace and blessings be upon him, said: "Among the major sins is a man cursing his parents." They said, "O Messenger of Allah, does a man curse his parents?" He said, "Yes. He insults a man's father, so that man insults his father, and he insults his mother, so that man insults his mother."