Never does a Muslim plants a tree except that he has the reward of charity for him, for what is eaten out of that is charity; what is stolen out of that, what the beasts eat out of that, what the birds eat out of that is charity for him. (In short) none incurs a loss to him but it becomes a charity on his part.
Sahih Muslim Book 22, Hadith 7
← Previous Hadith We would let you continue there so long as we will desire. So they continued (to cultivate the lands) till 'Umar externed them to Taima' ang Ariha (two villages in Arabia, but out of Hijaz).

Sahih Muslim Book 22, Hadith 6 Next Hadith → Who has planted these trees of dates-a Muslim or a non-Musim? She said: A Muslim, of course, whereupon he said: Never a Muslim plants, or cultivates a land, and it out of that men eat, or the animals eat, or anything else eats, but that becomes charity on his (planter's) behalf.

Sahih Muslim Book 22, Hadith 8