And Abu Bakr ibn Abi Shaybah and Muhammad ibn Abdullah ibn Numayr narrated to us, both saying: Zayd — and he is Ibn Hubab — narrated to us, saying: Sayf ibn Sulayman narrated to me, saying: Qays ibn Sa'd informed me, on the authority of Amr ibn Dinar, on the authority of Ibn Abbas, that the Messenger of Allah, peace and blessings be upon him, ruled on the basis of an oath and a single witness.