Musnad Ahmad 30:1400

'Affan narrated to us, Hammad ibn Salamah narrated to us, from Thabit, from Abu Rafi', from Abu Hurairah, that the Messenger of Allah, peace and blessings of Allah be upon him, said: "There was a tree that was harming the people of the road, so a man cut it down and moved it away from the road, and he entered Paradise."