Musnad Abu Ya'la al-Mawsili 118:72

Abu Musa Harun ibn Abdullah narrated to us, Ibn Abi Fudayk narrated to us, from Umar ibn Hafs, from Uthman ibn Abd al-Rahman, from al-Zuhri, from Anas, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever is pleased to be safe, let him adhere to silence."