Muhammad ibn al-Muthanna and Ibn Bashshar narrated to us, both saying: Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, from 'Amr ibn Murrah, who said: I heard Sa'id ibn al-Musayyab say: 'Uthman ibn Abi al-'As narrated, saying: The last thing the Messenger of Allah, peace and blessings be upon him, enjoined upon me was: "When you lead a people in prayer, make the prayer light for them."