Musnad Ahmad 30:2090

Nuh ibn Maymun narrated to us, he said: Abdullah—meaning al-Umari—informed us, from Jahm ibn Abi al-Jahm, from Miswar ibn Makhramah, 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."