“Where their worm dieth not, and the fire is not quenched.”
Mark 9:48 — Greek Interlinear
Church Fathers on Mark 9:48
Because the Lord had taught us not to offend those who believe on Him, He now as next in order warns us how much we should beware of those who offend us, that is, who by their words or conduct strive to drag us into the perdition of sin; wherefore He says, 'And if thy hand offend thee, cut it off.'
Or else, 'It is better for thee to enter into life maimed,' that is, without the chief place, for which you have wished, than having two hands to go into eternal fire. The two hands for high station are humility and pride; cut off pride, keeping to the estate of lowliness.
But those who hold that both of these, namely, the fire and the worm, belong to the pains of the soul, and not of the body, say also that those who are separated from the kingdom of God are tortured, as with fire, by the pangs of a soul repenting too late and hopelessly; and they not unfitly contend that fire may be put for that burning grief, as says the Apostle, 'Who is offended, and I burn not?' [2 Cor 11:29]