Hebrews 12:25-29

Be careful, then, and do not refuse to hear him who speaks. Those who refused to hear the one who gave the divine message on earth did not escape. How much less shall we escape, then, if we turn away from the one who speaks from heaven! His voice shook the earth at that time, but now he has promised, “I will once more shake not only the earth but heaven as well.” The words “once more” plainly show that the created things will be shaken and removed, so that the things that cannot be shaken will remain. Let us be thankful, then, because we receive a kingdom that cannot be shaken. Let us be grateful and worship God in a way that will please him, with reverence and awe; because our God is indeed a destroying fire.