Musannaf Ibn Abi Shayba 13:649

Abu Bakr narrated to us, he said: Abd al-A’la narrated to us, from Bard, from Sulayman ibn Musa, he said: The Messenger of Allah (may Allah bless him and grant him peace) passed by a man selling food that had barley mixed into it. He said: "Separate this from this, and this from this, then sell however you wish. Then sell this however you wish, for there is no deception in our religion."