Musannaf Ibn Abi Shayba 35:456

Waki’ narrated to us, from Sufyan, from Khalid, from Abu Qilabah, from Abu al-Ash’ath, from ‘Ubadah ibn al-Samit, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Barley for barley, like for like, hand to hand."