Musnad Ahmad 1301:2

Abu al-Mughirah narrated to us, he said: Abu Bakr ibn Abi Maryam narrated to us, he said: Humayd ibn Uqbah ibn Ruman narrated to me, from Abu al-Darda’, from the Prophet, may God bless him and grant him peace, that he said: "Whoever removes from the path of the Muslims something that harms them, God writes for him a good deed for it. And whoever has a good deed written for him by Him, God will cause him to enter Paradise by means of it."