Musnad Ahmad 789:22

Hassan ibn Musa narrated to us, Abu Bakr—meaning Ibn Shu'ayb ibn al-Habhab—narrated to us, he said: I heard Abu al-Wazi' Jabir al-Rasibi mention that Abu Barzah narrated to him, he said: I asked the Messenger of Allah, may Allah bless him and grant him peace, and I said: "O Messenger of Allah, I do not know, perhaps you may pass away and I remain after you, so tell me something that Allah may benefit me with." The Messenger of Allah, may Allah bless him and grant him peace, said to him: "Do such and such, do such and such." I have forgotten that. "And remove harm from the path."