Moser I - no Olam HaBah

Rosh Hashanna (17a):Wrongdoers of Israel who sin with their body7 and wrongdoers of the Gentiles who sin with their body go down to Gehinnom and are punished there for twelve months. After twelve months their body is consumed and their soul is burnt and the wind scatters them under the soles of the feet of the righteous as it says, And ye shall tread down the wicked, and they shall be as ashes under the soles of your feet.8 But as for the minim9 and the informers and the scoffers,10 who rejected the Torah and denied the resurrection of the dead, and those who abandoned the ways of the community,11 and those who ‘spread their terror in the land of the living’,12 and who sinned and made the masses sin, like Jeroboam the son of Nebat and his fellows — these will go down to Gehinnom and be punished there for all generations, as it says, And they shall go forth and look upon the carcasses of the men that have rebelled against me13 etc. Gehinnom will be consumed but they will not be consumed, as it says, and their form shall wear away the nether world.

Rambam(Hilchos Teshuva 3:6): These are the ones who have no portion in the World to Come but are cut off and lost and are judged because of the enormity of their wickedness and sins for eternity – apostates, heretics, deniers of the Torah, deniers of resurrection of the dead or redemption, those who cause the masses to sin, those who separate from participation in the community, one who sins openly…, the informers, and those who cause fear in the community for ulterior motives, murderers, habitual speakers of lashon harah and those who deface their circumcision.

Shulchan Aruch (C.M. 388:9): Who ever hands over a Jew into the hands of non‑Jews – whether it is the Jew himself or just his money – does not have a portion in the World to Come.