2 Peter 2:21; 2 Peter 3:2

2 Peter 2:21

21 For it would be better for them not to have known the way of righteousness, than having known it, to turn away from the holy commandment handed on to them.

2 Peter 3:2

2 that you should remember the words spoken beforehand by the holy prophets and the commandment of the Lord and Savior spoken by your apostles.