Hebrews 12:25-26

YLT(i) 25 See, may ye not refuse him who is speaking, for if those did not escape who refused him who upon earth was divinely speaking—much less we who do turn away from him who speaketh from heaven, 26 whose voice the earth shook then, and now hath he promised, saying, `Yet once—I shake not only the earth, but also the heaven;'