Musnad Abu Ya'la al-Mawsili 109:196

Narrated to us Sufyan, narrated to us Abd al-Wahhab al-Thaqafi, from Ayyub, from Hisham, from Wahb ibn Kaysan, from Jabir ibn Abdullah, from the Prophet (peace be upon him), who said: "Whoever revives dead land, for him is a reward. And whatever the wild animals eat from it, it is for him as charity."