Musnad Ahmad 28:370

Yunus narrated to us, Hammad—meaning Ibn Salamah—narrated to us, from Humayd, and Matar al-Warraq, and Dawud ibn Abi Hind, from ‘Amr ibn Shu‘ayb, from his father, from his grandfather: That the Messenger of Allah (peace and blessings of Allah be upon him) went out to his companions while they were disputing regarding the Decree (al-Qadar). This one was citing a verse, and that one was citing a verse. Then he mentioned the hadith.