I heard the Messenger of Allah ﷺ say, "I am Muhammad, and Ahmad, and the Gatherer, and the Eraser, and the Seal, and the Last to Come."
قال حدثنا حسن وعفان قالا حدثنا حماد بن سلمة عن جعفر بن أبي وحشية وقال أحدهما جعفر بن إياس
سمعت رسول الله ﷺ يقول أنا محمد وأحمد والحاشر والماحي والخاتم والعاقب
Its isnad is sahih. Jafar bin Abu Wahshiya is Jafar bin Iyas, one of the well-known trustworthy narrators mentioned many times before. The hadith has already appeared at 16280.