Musnad Abu Ya'la al-Mawsili 42:138

Ishaq ibn Ibrahim narrated to us, Abu Ubaydah narrated to us, Hisham narrated to us, from Abu al-Jarud, from Atiyyah, from Abu Sa’id, that the Messenger of Allah (may Allah bless him and grant him peace) said: "There is no Muslim who feeds a Muslim while he is hungry, except that Allah feeds him from the fruits of Paradise. And there is no Muslim who clothes his brother while he is naked, except that Allah clothes him from the green garments of Paradise. And whoever gives a Muslim a drink while he is thirsty, Allah will give him a drink from the sealed nectar (al-rahiq)."