Mark 9:48-49

where 'their worm does not die, and the fire is not put out.'

Hebrews 10:27

there is only a fearful anticipation of judgment, and a burning indignation which will destroy all opponents.

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 does not die, and the fire is not put out.'
Hebrews 10:27
there is only a fearful anticipation of judgment, and a burning indignation which will destroy all opponents.