2 Peter 2:21; 2 Peter 3:2

2 Peter 2:21

21 For it had been better for them not to have known the way of righteousness, than, after they have known it, to turn from the holy commandment delivered unto them.

2 Peter 3:2

2 That ye may be mindful of the words which were spoken before by the holy prophets, and of the commandment of us the apostles of the Lord and Saviour: