Musannaf Ibn Abi Shayba 13:404

Waki’ narrated to us, from Abu Ja’far al-Razi, from al-Rabi’ ibn Anas, who said: I saw Safwan ibn Muhriz, and he came to the market, and with him was a counterfeit dirham. He said, "Who will sell me good grapes for a bad dirham?" So he bought them, and he did not call for witnesses.