Jews dont believe in salvation in general.
There is no "hell" like Christians or muslims have hell. There is no "heaven" either.
Its more like, a world to come in which the Jews participate (and the righteous gentiles as well).
Their "hell" doctrine is like, depends on who you ask, its not as clear cut as for Christians and muslims.
Jews were saved in sleep before Christ lived in the flesh. They were saved in sleep through the blood of Christ shed for them at the time Adam and Eve disobeyed. They repented of sin and used the blood of animals as a symbol of Christ, even though they had little understanding of Christ, it was a mystery to them.
The Lord ordered them to do that, and told them that He hated the blood of animals if they were shed as the heathen did, to feed their gods. God ordered them to shed the blood of animals as blood He shed on the altar, and we know that blood God shed on the altar was Christ's blood.
Those saints preserved in sleep woke and walked the streets of Jerusalem when Christ's earthly body died and His spirit lived at the cross.
Those who loved the Lord and asked forgiveness were saved in sleep before Christ, the question now is how God treats their repentance and asking forgiveness now they think the Messiah is yet to come?