Musnad Ahmad 349:1

Zayd ibn al-Hubab narrated to us, he said: Sufyan informed me, from ‘Ata’ ibn al-Sa’ib, he 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, there are people from my nation who will be given the likes of the rewards of the first of them, for they will forbid the evil."