'The Gehenna (Gey Hinnom) of the Fire', spoken of by Jesus —
The Hebrew Gei-Hinnom in the Jewish Bible does not intrinsically carry the idea of its Greek equivalent Gehenna. Jesus speaks of Gehenna as a place for punishment and He associates it with fire in the Greek expression 'the Gehenna of the fire'.
but I say unto you, that every one who is angry with his brother shall be in danger of the judgment; and whosoever shall say to his brother, Raca, shall be in danger of the council; and whosoever shall say, Thou fool, shall be in danger of the hell [Gehenna] of fire. Matthew 5:22 ASV
And if thine eye causeth thee to stumble, pluck it out, and cast it from thee: it is good for thee to enter into life with one eye, rather than having two eyes to be cast into the hell [Gehenna] of fire. Matthew 18:9 ASV
And if your eye offend you, pluck it out: it is better for you to enter into the Kingdom of Elohiym with one eye, than having two eyes to be cast into the fire of Gey Hinnom: Mark 9:47 Cepher
Jesus also associates Gehenna with a place of 'unquenchable fire'. The Book of revelation speaks of the lake of fire where torment is day and night, for ever and ever.
And if thy hand offend thee, cut it off: it is better for thee to enter into life maimed, than having two hands to go into hell [Gehenna], into the fire that never shall be quenched: Mark 9:43 KJV
And if thy foot offend thee, cut it off: it is better for thee to enter halt into life, than having two feet to be cast into hell [Gehenna], into the fire that never shall be quenched: Mark 9:45 KJV
And the beast was taken, and with him the false prophet that wrought the signs in his sight, wherewith he deceived them that had received the mark of the beast and them that worshipped his image: they two were cast alive into the lake of fire that burneth with brimstone: Revelation 19:20 ASV