Salaam
Another verse I found that talks a bit about a book being sent to the messenger. Not too sure if it's simply referring to muhammad alone in this context who was also a prophet.
O you who have believed, believe in Allah and His Messenger and the Book that He sent down upon His Messenger and the Scripture which He sent down before. And whoever disbelieves in Allah, His angels, His books, His messengers, and the Last Day has certainly gone far astray.
-Surah An-Nisa', Ayah 136