Musannaf Ibn Abi Shayba 33:130

'Abdah ibn Sulayman narrated to us, from Isma'il ibn Abi Khalid, from Sa'd al-Ta'i, that it reached him that the Messenger of Allah (may Allah bless him and grant him peace) said: "There is no believer who feeds a hungry believer except that Allah will feed him from the fruits of Paradise. And there is no believer who gives a believer a drink when he is thirsty except that Allah will give him a drink from the sealed nectar (rahiq makhtum). And there is no believer who clothes a naked believer except that Allah will clothe him from the green garments of Paradise."