Musannaf Ibn Abi Shayba 33:787

Waki’ narrated to us, he said: Al-A’mash narrated to us, from Hakim ibn Jubayr, from Mujahid, from ‘Ubayd ibn ‘Umayr, he said: The poor of the Emigrants (Muhajirun) will come on the Day of Resurrection, their spears and their swords dripping with blood. He said: It will be said to them, "Stay where you are until you are brought to account." He said: They will say, "And did you give us anything that you should bring us to account for it?" He said: So that will be looked into, and nothing will be found except their saddles upon which they emigrated. He said: Then they will enter Paradise five hundred years before the people.