Hebrews 12:25-26

ISV(i) 25 See to it that you do not ignore the one who is speaking. For if the hearers did not escape when they ignored the one who warned them on earth, how much less will we escape if we turn away from the one who is from heaven! 26 At that time his voice shook the earth, but now he has promised, “Once more I will shake not only the earth but also heaven.”