Matthew 5:28

“But I say to you that everyone who keeps on looking at a woman so as to have a passion for her has already committed adultery with her in his heart.”

https://en.m.wikipedia.org/wiki/Pastoral_epistles

Any attempt to justify banning books from the New Testament is indirect at best. All Christians play loosy-goosy with the Bible to some degree. There are things Jesus directly warned against like gathering wealth that most Christians have no problem doing. Paul seems kinda iffy about marriage but for many Christians that's a core religious value. Meanwhile there's a bunch of stuff like book banning or being gay that's at best ambiguously condemned in the Bible that people are up in arms over.

For anyone curious.