Musnad Ahmad 33:246

Yahya narrated to us, from Hisham—meaning Ibn Urwah—who said: Ubayd Allah ibn Abd al-Rahman al-Ansari informed me, saying: I heard Jabir ibn Abdullah saying: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever revives dead land, he has a reward for it, and whatever the creatures eat from it, he has a reward for it."