God does not expect us to live by every word of the NT. It's impossible. Even Paul could not live a perfect,sinless life per his own admission.<quoted text>
Then why don't you believe the rest of what Scripture says?, Peter would follow the whole New Covenant to the letter as would all the Apostles, they wrote it down from God for us.
Just saying says the words on the mount that Jesus spoke are words we live by, agree, so why not live by all the words of the NT?
God does not expect us to live a perfect life,obeying every word of the Bible but He expects us to merely do our best and when we do our best, even if we fall short,God considers that to be perfect. What a great God we serve huh?