Steve Ray has a list of 35 loaded Questions for "Bible Christians" (quotation marks his)(link to the whole list). This is number 2/35. I'm trying to provide the answers in a common format, for easy reference.
2) Other than the specific command to John to pen the Revelation, where did Jesus tell His apostles to write anything down and compile it into an authoritative book?
Nowhere that we know of.
1) But all of Jesus' instructions that we know of, we know of from an authoritative book.
2) And Scripture does tell us that these Scriptures are given to us by the will of God not the will of man:
2 Peter 1:19-21
We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts: knowing this first, that no prophecy of the scripture is of any private interpretation. For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost.