Musannaf Ibn Abi Shayba 27:330

31968. Abdullah bin Numayr narrated to us, from Muhammad bin Ishaq, from Makhul, from Ghudayf bin al-Harith, a man from Ayla, from Abu Dharr, who said: I heard the Messenger of Allah, may Allah bless him and grant him peace, say: "Indeed, Allah has placed the truth upon the tongue of Umar."