Abdullah bin al-Musawir said: I heard Ibn Abbas (may Allah be pleased with them both) while he was accusing Ibn al-Zubayr (may Allah be pleased with them both) of stinginess. He said: I heard the Messenger of Allah (peace and blessings be upon him) saying: "He is not a believer who eats his fill while his neighbour remains hungry."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19668