It is narrated from Sayyiduna Maslamah bin Mukhallad (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The Muhajirun will enter Paradise forty years before the rest of the people. They will be enjoying its delights while the people are held back for the reckoning. Then the second group (will enter) a hundred years (later)."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17113