“Where their worm
Never dies.
The fire
Is never quenched.”
ὅπου ὁ σκώληξ αὐτῶν οὐ τελευτᾷ καὶ τὸ πῦρ οὐ σβέννυται.
This verse is a further explanation about Gehenna or hell. It was in verse 9:44 and will be in 9:48. Thus, in many manuscripts, verses 44 and 46 are omitted as repetitions, so that only verse 48 is listed with just empty space between these other verses. Mark indicated that Jesus said that hell was where their gnawing or anguishing worm would never die (ὅπου ὁ σκώληξ αὐτῶν οὐ τελευτᾷ) because the fire was never extinguished or quenched (καὶ τὸ πῦρ οὐ σβέννυται). They would have eternal discomfort and anguish with a gnawing worm and a fire that never went out.
Eugene Finnegan Bible Project 