Those books are very important to our salvation, they explain who Jesus is and what he did, and what the standards of God are. Just as Jesus quoted the OT , and Paul quoted the OT. I quote the OT all the time. Here is an example; You know the great commandments that Jesus gave, love the Lord with all your heart, mind and, spirit, and love your neighbor as yourself; there are laws that inform us of how to love our neighbors. Example Leviticus 19:9-37 if you read these laws you will know what it means to love your neighbor, even though we are not under the law.
If you can't understand that we have no conversation to discuss.