Musnad Abu Ya'la al-Mawsili 117:221

Al-Jarrah ibn Makhlad narrated to us, Abu Qutaybah Salm ibn Qutaybah al-Sha'iri narrated to us, Suhayl ibn Abi Hazm narrated to us, Thabit narrated from Anas, who said: The Messenger of Allah (may Allah bless him and grant him peace) recited this verse to us: "Indeed, those who have said, 'Our Lord is Allah,' and then remained on a right course." He then said: "People have said it, but most of them disbelieved. So whoever says it until he dies, he is among those who remained on a right course regarding it."