Musnad Ahmad 937:268

Yahya ibn Adam and Yahya ibn Abi Bukayr narrated to us, they said: Zuhayr narrated to us, from Mutarrif—Ibn Abi Bukayr said: Mutarrif al-Harithi narrated to us—from Abu al-Jahm—Ibn Abi Bukayr said: the freed slave of al-Bara’, and he praised him with good—from Khalid ibn Wahban—Ibn Abi Bukayr said: or Wahban—from Abu Dharr, who said: The Prophet (peace and blessings of Allah be upon him) said: "How will you be when there are leaders after me who will claim this booty for themselves?" I said: "Then, by the One who sent you with the truth, I will place my sword upon my shoulder, then I will strike with it until I meet you or join you." He said: "Shall I not guide you to what is better than that? You shall be patient until you meet me."