Musannaf Ibn Abi Shayba 13:2536

Abu Bakr narrated to us, he said: Ali ibn Mushir narrated to us, from al-Shaybani, from Jabalah ibn Suhaym, from Abdullah ibn Umar, who said: "O people, do not buy a dinar for two dinars, nor a dirham for two dirhams, for I fear for you the *rima*." It was said: "And what is the *rima*?" He said: "That which you call *riba* (usury)."