18 For you have not come [a]to the mountain that may be touched and that burned with fire, and to blackness and [b]darkness and tempest, 19 and the sound of a trumpet and the voice of words, so that those who heard itbegged that the word should not be spoken to them anymore. 20 (For they could not endure what was commanded: “And if so much as a beast touches the mountain, it shall be stoned[c]or shot with an arrow.”21 And so terrifying was the sight that Moses said, “I am exceedingly afraid and trembling.”)
28 Anyone who has rejected Moses’ law dies without mercy on the testimony of two or three witnesses. 29 Of how much worse punishment, do you suppose, will he be thought worthy who has trampled the Son of God underfoot, counted the blood of the covenant by which he was sanctified a common thing, and insulted the Spirit of grace?
2 Thessalonians 1:8-9New King James Version (NKJV)
8 in flaming fire taking vengeance on those who do not know God, and on those who do not obey the gospel of our Lord Jesus Christ. 9 These shall be punished with everlasting destruction from the presence of the Lord and from the glory of His power,
4 “For behold, the day is coming, Burning like an oven, And all the proud, yes, all who do wickedly will be stubble. And the day which is coming shall burn them up,” Says the Lord of hosts, “That will leave them neither root nor branch.
2 “But who can endure the day of His coming? And who can stand when He appears? For He is like a refiner’s fire And like launderers’ soap. 3 He will sit as a refiner and a purifier of silver; He will purify the sons of Levi, And [a]purge them as gold and silver, That they may offer to the Lord An offering in righteousness.
6 “Behold, it is written before Me: I will not keep silence, but will repay— Even repay into their bosom— 7 Your iniquities and the iniquities of your fathers together,” Says the Lord, “Who have burned incense on the mountains And blasphemed Me on the hills; Therefore I will measure their former work into their bosom.”
3 A fire goes before Him, And burns up His enemies round about. 4 His lightnings light the world; The earth sees and trembles. 5 The mountains melt like wax at the presence of the Lord, At the presence of the Lord of the whole earth.