John 15:6
If a person does not remain united to me, he will be thrown out as a [fruitless] branch and dried up. People gather up such branches and throw them into the fire to be burned [as fuel ?].
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."
Hebrews 6:8
But if the land produces [only] thorns and thistles, it is worthless and in danger of being cursed [by God], and will end up being burned.
Hebrews 12:29
for our God is truly a consuming fire.