Matthew 3:12
His winnowing shovel [Note: This was a process whereby grain was tossed into the air so that the wind could blow the husks away, leaving only good grain on the ground] is in His hand and He will completely clear off His threshing floor [by removing all of the husks]. And He will gather His wheat into the barn, but will burn up the husks with a fire that will never go out."
2 Thessalonians 1:8-9
He will inflict punishment on those people who do not know God [as Savior], and on those who do not obey the Gospel message of our Lord Jesus.
Hebrews 2:3
how will we escape [punishment] if we neglect such a great salvation? [For it was] first announced [to people] by the Lord and then confirmed to us [i.e., the writer and other Christians] by those who heard Him [i.e., the original apostles].
Hebrews 10:28-29
The person who has disregarded the law of Moses is put to death without being shown mercy on the testimony of two or three witnesses.
Hebrews 12:18-21
[Unlike the Israelites at Mount Sinai] you [Christians] have not come to a mountain that can be touched and that burned with fire [See Ex. 19:12, 16-19; 20:18-21; Deut. 4:11]; to [a place of] darkness, gloom and wind;
Hebrews 12:29
for our God is truly a consuming fire.
Revelation 22:20
The One who testifies about these things [i.e., Jesus] says, "Yes, I am coming soon." May this be so. Come [ahead] Lord Jesus!