Parallel
Mark 9:48
Nestle 1904 Greek New Testament · Berean Standard Bible
ὅπου Ὁ σκώληξ αὐτῶν οὐ τελευτᾷ καὶ τὸ πῦρ οὐ σβέννυται
where ‘their worm never dies, and the fire is never quenched (note: Isaiah 66:24).’