Mark 9:44

42 And whosoever shall offend one of these little ones that believe in me, it is better for him that a millstone were hanged about his neck, and he were cast into the sea.

43 And if thy hand offend thee, cut it off: it is better for thee to enter into life maimed, than having two hands to go into hell, into the fire that never shall be quenched:

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

45 And if thy foot offend thee, cut it off: it is better for thee to enter halt into life, than having two feet to be cast into hell, into the fire that never shall be quenched:

46 Where their worm dieth not, and the fire is not quenched.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

KJV
Where their worm dieth not, and the fire is not quenched.
WEB
‘where their worm doesn’t die, and the fire is not quenched.’
ASV
[where their worm dieth not, and the fire is not quenched.]
DARBY
[where their worm dies not, and the fire is not quenched].
ÅB
hvor deres orm ikke dør, og ilden ikke slukkes.
OTB
[hvor deres orm ikke dør, og ilden ikke slukkes.]
B1930
hvor deres orm ikke dør, og ilden ikke slukkes.

Study notes (Tyndale)

Original text and word study