Abu Dawud Book 3, Hadith Number 1678.

Narated By AbuSa’id al-Khudri : The Prophet (PBUH) said: If any Muslim clothes a Muslim when he is naked, Allah will clothe him with some green garments of Paradise; if any Muslim feeds a Muslim when he is hungry, Allah will feed him with some of the fruits of Paradise; and if any Muslim gives a Muslim drink when he is thirsty, Allah will give him some of the pure wine which is sealed to drink.