Matthew doesn’t disclose his use of Mark. When did ancient authors cite their sources and when did they not?
gMatthew seems to use gMark but the author never tells us what he is using. 2 Peter seems to use Jude but the author never tells us what he is using. The apostolic fathers seem to often, if not always, let us know they’re using something.
How should we understand this difference? Does an ancient author using but not citing another author tell us anything about their view of the original text? Is it just a matter of genre?
Thank you!