In the OT men could offer a sacrifice for their sins, but it was never expected that they wouldn't sin again.How is that? The old testament is full of men repenting before God and God honoring their repentance.
In the NT we are given the opportunity to kill the flesh and be reborn of God's seed.
God's seed cannot bring forth evil fruit.
They were given the chance to offer sacrifices for their sins.The gift if repentance comes from God and those of the Old Testament were given the chance to repent and many saw this and did.
Can you provide a verse saying God offered repentance to the OT Jews?
Before John the Baptist, that is.
That might make for a good new thread...