It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "He has not believed in me who goes to sleep with a full stomach while his neighbour beside him is hungry, and he knows of it."
Hadith Referenceالمعجم الكبير للطبراني / باب الألف / 747