Mark 9:46
Where their worm dieth not, and the fire is not quenched.
Cross-reference
Mark 9:44
Parallel
Mark 9:44 is an identical parallel verse — both quote the same phrase about the undying worm and unquenchable fire.
Mark 9:48
Parallel
Mark 9:48 repeats the same phrase about undying worm and unquenchable fire — identical to Mark 9:46.
Matthew 25:46
Related theme
In Matthew 25:46, eternal punishment is the fate of the unrighteous — the same outcome depicted by the undying worm and unquenchable fire in Mark 9:46.
Luke 16:24–26
Related theme
Luke 16:24-26 describes the rich man in fiery torment with a fixed chasm — echoing the undying worm and unquenchable fire of Mark 9:46.