Musnad Ahmad 789:28

Waki' narrated to us, Aban ibn Sam'ah narrated to us, from Abu al-Wazi' al-Rasibi, from Abu Barzah al-Aslami, who said: I said: "O Messenger of Allah, guide me to an action that will cause me to enter Paradise or by which I may benefit?" He said: "Remove the harm from the path of the Muslims."