Isa 2:18-21, 2 Thess 1:8-9, Rev 6:14-17
In the Old Testament, Isaiah asked God not to forgive those who did not believe in God and worshiped idols. (Isa 2:8-10)
Isa 2:8 Their land also is full of idols; they worship the work of their own hands, that which their own fingers have made: 9 And the mean man boweth down, and the great man humbleth himself: therefore forgive them not. 10 Enter into the rock, and hide thee in the dust, for fear of the Lord, and for the glory of his majesty.
In the Old Testament, Isaiah spoke of God destroying those who worship idols. (Isa 2:18-21)
Isa 2:18 And the idols he shall utterly abolish. 19 And they shall go into the holes of the rocks, and into the caves of the earth, for fear of the Lord, and for the glory of his majesty, when he ariseth to shake terribly the earth. 20 In that day a man shall cast his idols of silver, and his idols of gold, which they made each one for himself to worship, to the moles and to the bats; 21 To go into the clefts of the rocks, and into the tops of the ragged rocks, for fear of the Lord, and for the glory of his majesty, when he ariseth to shake terribly the earth.
Paul said that those who do not believe that Jesus is the Christ will perish forever. (2 Thessalonians 1:8-9)
2 Thessalonians 1:8 In flaming fire taking vengeance on them that know not God, and that obey not the gospel of our Lord Jesus Christ: 9 Who shall be punished with everlasting destruction from the presence of the Lord, and from the glory of his power;
When Jesus comes back to earth, He will destroy those who do not believe in Him as the Christ. (Revelation 6:14-17)
Revelation 6:14 And the heaven departed as a scroll when it is rolled together; and every mountain and island were moved out of their places. 15 And the kings of the earth, and the great men, and the rich men, and the chief captains, and the mighty men, and every bondman, and every free man, hid themselves in the dens and in the rocks of the mountains; 16 And said to the mountains and rocks, Fall on us, and hide us from the face of him that sitteth on the throne, and from the wrath of the Lamb: 17 For the great day of his wrath is come; and who shall be able to stand?