Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates: the Prophet (peace and blessings be upon him) said: "He has not believed in me who spends the night with a full stomach while his neighbour beside him is hungry, and he knows it."
Al-Tabarani and al-Bazzar recorded it, and the chain of al-Bazzar is hasan (good).