I've read many articles that talk about how the bible cannot be added to or have words taken away from it, then they reference revelations 22:18 as the reason
"18 I am warning everyone who hears the words of the prophecy of this book. If you add anything to them, God will add to you the plagues told about in this book. 19 If you take any words away from this book of prophecy, God will take away from you your share in the tree of life. He will also take away your place in the Holy City. This book tells about these things."
However revelations was originally a single book before it was added to the new testament when that was formed many years later, so you can't really apply it the more than just revelations right? not that im saying one should modify the bible.