Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates this saying of the Prophet (peace and blessings be upon him): "O people! Richness does not come from an abundance of goods; rather, true richness is richness of the soul. Allah Almighty gives the servant in full the provision He has decreed for him, so be moderate in seeking provision: take what is lawful and leave what He has made unlawful."
Abu Ya'la recorded it; its chain contains Ubayd bin Nistas, the freed slave of Kathir bin al-Salt, and I have not found anyone who gave his biography. The rest of its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب البيوع / 6286