Hebrews 12:25 in the King James Version
See that ye refuse not him that speaketh. For if they escaped not who refused him that spake on earth, much more shall not we escape, if we turn away from him that speaketh from heaven:
Context
24 to Jesus, the mediator of a new covenant, and to the blood of sprinkling that speaks better than that of Abel.
25 See that you don’t refuse him who speaks. For if they didn’t escape when they refused him who warned on the earth, how much more will we not escape who turn away from him who warns from heaven,
26 whose voice shook the earth then, but now he has promised, saying, “Yet once more I will shake not only the earth, but also the heavens.”