Musannaf Ibn Abi Shayba 33:162

Ubayd Allah ibn Musa narrated to us, from Musa ibn Ubaydah, from Abdullah ibn Dinar, from Ibn Umar, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Shall I not give you glad tidings, O assembly of the poor, that the poor of the believers will enter Paradise before their rich by half a day, [which is] five hundred years?"