Hebrews 12:25-29

See that ye refuse not him that speaks. For if those did not escape who had refused him who uttered the oracles on earth, much more we who turn away from him who does so from heaven: whose voice then shook the earth; but now he has promised, saying, Yet once will I shake not only the earth, but also the heaven. But this Yet once, signifies the removing of what is shaken, as being made, that what is not shaken may remain. Wherefore let us, receiving a kingdom not to be shaken, have grace, by which let us serve God acceptably with reverence and fear. For also our God is a consuming fire.