Musnad Ahmad 962:113

Abu al-Nadr narrated to us, Hariz narrated to us, from Abd al-Rahman ibn Maysarah, who said: I heard Abu Umamah saying: "There shall certainly enter Paradise, through the intercession of a single man who is not a prophet, the likes of two tribes, or one of the two tribes: Rabi'ah and Mudar." A speaker said: "O Messenger of Allah, is Rabi'ah not from Mudar?" He said: "I only say what I say."