It is narrated from Sayyiduna Abu Sa'id (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Any Muslim who clothes someone in his need, Allah Almighty will clothe him with the silk of Paradise; whoever feeds a Muslim in his hunger, Allah Almighty will feed him from the fruits of Paradise; and whoever gives a Muslim water to drink in his thirst, Allah will give him to drink of the sealed pure drink [Al-Mutaffifin: 25] (the finest drink)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7805