Musnad Ahmad 32:1445

Yunus narrated to us, he said: Abu 'Awanah narrated to us, from Qatadah, from Anas, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "There is no Muslim who plants a plant, or sows a crop, and then a bird, or a human, or a beast eats from it, but it will be a charity for him."