Sayyiduna Abu al-Darda' (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) said: "The poor of my Ummah will enter Paradise forty years before its wealthy (the narrator is unsure about the word used here for 'years')."
Al-Tabarani recorded it; its chain contains Muhammad bin Abi Kamil al-Mawsili, whom I do not know, and the rest of its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الزهد / 17893