Musnad Ahmad 2:60

Abu Sa’id, the freed slave of Banu Hashim, narrated to us, Al-Muthanna ibn ‘Awf al-‘Anazi, a Basran, narrated to us, he said: Al-Ghadban ibn Hanzalah informed me: That his father, Hanzalah ibn Nu’aym, came as a delegate to ‘Umar. Whenever a person from the delegation passed by ‘Umar, he would ask him who he was, until my father passed by him and he asked him: "Who are you?" He said: "From ‘Anazah." He said: "I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: 'A tribe from here, they are oppressed, yet they are granted victory.'"