Mark 9:48-49

where their worm dieth not, and the fire is not quenched.

Hebrews 10:27

but a certain fearful looking for judgment, and an indignation by fire, which will devour the adversaries.

Treasury of Scripture Knowledge

Summary

And the fire upon the altar shall be burning in it; it shall not be put out: and the priest shall burn wood on it every morning, and lay the burnt offering in order upon it; and he shall burn thereon the fat of the peace offerings.

Bible References

The fire

Mark 9:48
where their worm dieth not, and the fire is not quenched.
Hebrews 10:27
but a certain fearful looking for judgment, and an indignation by fire, which will devour the adversaries.