Isaiah 33:14
14 The sinners in Zion are afraid; Fearfulness has seized the hypocrites: "Who among us shall dwell with the devouring fire? Who among us shall dwell with everlasting burnings?"
Matthew 18:8
8 If your hand or foot causes you to sin, cut it off and cast it from you. It is better for you to enter into life lame or maimed, rather than having two hands or two feet, to be cast into the everlasting fire.
So, if the OT Jews did not have a concept of Hell like the one Jesus described, why does Isaiah speak of the sinners of Zion being afraid of being cast into "everlasting fire"?
Isaiah 66:15-16
15 For behold, the Lord will come with fire And with His chariots, like a whirlwind, To render His anger with fury, And His rebuke with flames of fire. 16 For by fire and by His sword The Lord will judge all flesh; And the slain of the Lord shall be many.
Matthew 25:41
41 Then He will also say to those on the left hand, 'Depart from Me, you cursed, into the everlasting fire prepared for the devil and his angels:
Revelation 19:15
15 Now out of His mouth goes a sharp sword, that with it He should strike the nations. And He Himself will rule them with a rod of iron. He Himself treads the winepress of the fierceness and wrath of Almighty God. (see also Rev. 20:11-15)
Isaiah says that God will judge "all flesh by fire and by His sword" and "rebuke with flames of fire," which we see echoed by Christ and explained very clearly in the apostle John's Revelation. The fiery punishment of Hell does not seem utterly unknown among the Jews of the OT.
Isaiah 66:24
24 "And they shall go forth and look Upon the corpses of the men Who have transgressed against Me. For their worm does not die, And their fire is not quenched. They shall be an abhorrence to all flesh."
Mark 9:43-48 (NKJV)
43 If your hand causes you to sin, cut it off. It is better for you to enter into life maimed, rather than having two hands, to go to hell, into the fire that shall never be quenched--
44 where 'Their worm does not die, And the fire is not quenched.'
45 And if your foot causes you to sin, cut it off. It is better for you to enter life lame, rather than having two feet, to be cast into hell, into the fire that shall never be quenched--
46 where 'Their worm does not die, And the fire is not quenched.'
47 And if your eye causes you to sin, pluck it out. It is better for you to enter the kingdom of God with one eye, rather than having two eyes, to be cast into hell fire--
48 where 'Their worm does not die, And the fire is not quenched.'
Jesus, speaking of the fiery judgment of Hell, quotes the OT prophet Isaiah, which, it seems plain to me, puts rather a crimp in the idea that the NT idea of a fiery place of torment of the wicked taught by Jesus did not exist in the OT.
Selah.