Sahih Muslim Book 10, Hadith Number 3766.

Chapter : Merit of giving respite to one who is in straitened circumstances.

Jabir b. ‘Abdullah (Allah be pleased with them) reported: I heard Allah’s Messenger (may peace be upon him) saying: Never does a Muslim plant, or cultivate, but has reward for him for what the beasts eat, or the birds eat or anything else eats out of that.