So in the past week, we've discovered that apart from the command to John to pen the Revelation, no specific command from Christ was ever given, to any of the other apostles, to sit down and write various letters and accounts that should then be compiled into a book nearly 400 years later.

This week's question follows a similar line of thought:

Where in the New Testament do the apostles tell future generations that the Christian faith will be based solely on a book?

I cannot over-emphasize the "New Testament" part, because there have been issues in the past two weeks with people reading the questions properly.  Both of the previous questions have asked for recorded sayings from Jesus specifically, which should have limited citations to the four Gospels.

That didn't happen, of course.  So let's see this week if we can improve on the performance...or will we see quotations from the Old Testament given as answers?