Sahih Muslim 49a

Abu Bakr ibn Abi Shaybah narrated to us; Waki' narrated to us, from Sufyan. H. Muhammad ibn al-Muthanna narrated to us; Muhammad ibn Ja'far narrated to us; Shu'bah narrated to us. Both narrated from Qays ibn Muslim, from Tariq ibn Shihab—and this is Abu Bakr's hadith—who said: The first to begin delivering the sermon on the day of Eid before the prayer was Marwan. A man stood up to him and said, ‘The prayer comes before the sermon.’ He said, ‘That practice has been abandoned.’ Abu Sa'id said, ‘As for this man, he has fulfilled what was required of him.’ I heard the Messenger of Allah (peace and blessings be upon him) say, ‘Whoever among you sees something reprehensible, let him change it with his hand; if he cannot, then with his tongue; and if he cannot, then with his heart—and that is the weakest faith.’