It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever feeds his brother until he is full and gives him water to drink until his thirst is quenched, Allah will keep him away from Hell by seven trenches, between each trench a distance of five hundred years' journey."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13732