Hebrews 12:25-29

25See to it that you do not refuse Him who speaks. For if the people did not escape when they refused Him who warned them on earth, how much less will we escape if we reject Him who warns us from heaven? 26At that time His voice shook the earth, but now He has promised, “Once more I will shake not only the earth, but heaven as well.”1 27The words “Once more” signify the removal of what can be shaken—that is, created things—so that the unshakable may remain.

28Therefore, since we are receiving an unshakable kingdom, let us be filled with gratitude, and so worship God acceptably with reverence and awe. 29“For our God is a consuming fire.”2