Musnad Ahmad 790:181

Surayj ibn al-Nu‘man narrated to us, Hushaym narrated to us, Mansur, Humayd, and Yunus informed us, from al-Hasan, from ‘Imran ibn Husayn, who said: "The Messenger of Allah (may Allah bless him and grant him peace) used to deliver sermons to us, and he would command us to give charity, and he would forbid us from mutilation."