Musannaf Ibn Abi Shayba 13:2078

Abu Bakr narrated to us, he said: Mu'adh ibn Mu'adh narrated to us, he said: Husayn al-Mu'allim narrated to us, from Qays ibn Sa'id, from Mujahid, who said: I said to Abd al-Rahman ibn Abi Layla: "Narrate to us a hadith in which you gather for me the categories of usury (riba)." He said: "Do not consume the increase of anything that does not have a guarantee upon it."