The Muratorian canon (c. 170–200) is a manuscript fragment that contains the oldest known list of the books of the New Testament that is orthodox. The beginning and end of the manuscript is missing. It was discovered by historian Ludovico Antonio Muratori, a well-known historian, in an Italian library.
The list includes the following books:
The list does not include 1 Peter, 2 Peter, and 3 John. It also includes a few writings that are not part of the orthodox New Testament canon.
Thus, by the end of the second century, most of the 27 books of the New Testament were viewed as inspired and authoritative.