It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Through the intercession of a single man who is not a prophet, there will certainly enter Paradise people as many as two tribes, or one of the two tribes, Rabi'ah and Mudar."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7607