Musnad Ahmad 1018:120

Zayd ibn al-Hubab narrated to us, Sufyan informed me, from ‘Ata’ ibn al-Sa’ib, who said: I heard ‘Abd al-Rahman ibn al-Hadrami saying: Someone who heard the Prophet, may Allah bless him and grant him peace, saying informed me: "Indeed, among my nation are people who will be given the likes of the rewards of the first of them; they denounce the evil."