Musnad Ahmad 962:160

Abu al-Mughirah narrated to us, Hariz narrated to us, Abd al-Rahman ibn Maysarah al-Hadrami narrated to us, he said: I heard Abu Umamah saying: The Messenger of Allah, may Allah bless him and grant him peace, said to me: "There shall certainly enter Paradise, through the intercession of a single man—who is not a prophet—the likes of the two tribes, or one of the two tribes: Rabi'ah and Mudar." A speaker said: "But Rabi'ah is only from Mudar." He said: "I only say what I say."