Musnad Ahmad 789:39

Abu Sa'id narrated to us, Shaddad Abu Talhah narrated to us, he said: Jabir ibn 'Amr Abu al-Wazi' narrated to us, from Abu Barzah, who said: I said: "O Messenger of Allah, command me with a deed that I may perform." He said: "Remove the harmful object from the road, for it is a charity for you."