Musannaf Ibn Abi Shayba 19:37

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Sufyan, from Hammad, from Ibrahim, who said: Abdullah said: "The hand is not to be cut except for a shield (turs) or a buckler (hajafa)." He said: I said to Ibrahim, "What is its value?" He said: "A dinar."