Musannaf Ibn Abi Shayba 27:348

Khalid ibn Makhlad narrated to us, from al-Umari, from Jahm ibn Abi al-Jahm, from al-Miswar ibn Makhrama, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, Allah has placed the truth upon the tongue of Umar and in his heart."