Hebrews 12:25-29

So see to it that you do not reject Him or refuse to listen to and heed Him Who is speaking [to you now]. For if they [the Israelites] did not escape when they refused to listen and heed Him Who warned and divinely instructed them [here] on earth [revealing with heavenly warnings His will], how much less shall we escape if we reject and turn our backs on Him Who cautions and admonishes [us] from heaven? Then [at Mount Sinai] His voice shook the earth, but now He has given a promise: Yet once more I will shake and make tremble not only the earth but also the [starry] heavens. [Hag. 2:6.] Now this expression, Yet once more, indicates the final removal and transformation of all [that can be] shaken–that is, of that which has been created–in order that what cannot be shaken may remain and continue. [Ps. 102:26.] Let us therefore, receiving a kingdom that is firm and stable and cannot be shaken, offer to God pleasing service and acceptable worship, with modesty and pious care and godly fear and awe; For our God [is indeed] a consuming fire. [Deut. 4:24.]