Sayyiduna Abdullah bin Amr (may Allah be pleased with him) said: One day the Prophet (peace and blessings be upon him) came out to us, and it seemed as though he were bidding farewell. He said: "I am the unlettered Prophet." He (peace and blessings be upon him) said this three times. (Then he said:) "There will be no Prophet after me. I have been given clear and comprehensive words. I know the angels who guard Hell and the angels who carry the Throne. Ease has been granted to me, well-being has been granted to me and well-being has been granted to my Ummah. As long as I am among you, obey and follow; and when I depart, it is obligatory upon you to follow the Book of Allah Almighty: treat as lawful what it makes lawful and treat as unlawful what it makes unlawful."
Ahmad recorded it; its chain contains Ibn Lahi'ah, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب العلم / 778