2 Peter 2:4; 2 Peter 2:21

2 Peter 2:4

4 For if God did not spare angels when they sinned, but cast them into hell and committed them to pits of darkness, reserved for judgment;

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.