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25 Lest you be wise in your own sight, I want you to understand this mystery, brothers: a partial hardening has come upon Israel, until the fullness of the Gentiles has come in. 26And in this way all Israel will be saved, as it is written,

“The Deliverer will come from Zion,
he will banish ungodliness from Jacob”;
27”and this will be my covenant with them
when I take away their sins.”

That's either a deliberate mistranslation or a misquote.

Isaiah 59 (JPS)
20 And a redeemer will come to Zion, and unto them that turn from transgression in Jacob, saith YHWH.

Isaiah 59 (NASB)
20 "A (1) Redeemer will come to Zion, And to those who (2) turn from transgression in Jacob," declares the LORD.

21 "As for Me, this is My covenant with them," says the LORD: "My Spirit which is upon you, and My words which I have put in your mouth shall not depart from your mouth, nor from the mouth of your offspring, nor from the mouth of your offspring's offspring," says the LORD, "from now and forever."

cross-references

Rom 11:26
Ezek 18:30, 31

Romans 11
26   and so all Israel will be saved; just as it is written, "(1) THE DELIVERER WILL COME FROM ZION, HE WILL REMOVE UNGODLINESS FROM JACOB."

cross-references
1. Is 59:20

Ezekiel 18
30   "Therefore I will judge you, O house of Israel, each according to his conduct," declares the Lord GOD. "(1) Repent and turn away from all your transgressions, so that iniquity may not become a stumbling block to you.
31   "(2) Cast away from you all your transgressions which you have committed and make yourselves a (3) new heart and a new spirit! For why will you die, O house of Israel?

Notice that the Redeemer will come TO Zion, NOT comes FROM Zion.

Notice also that the Redeemer goes to those that turn away from transgression/sin of their own ability, NOT a welfare type where someone else removes the sin from them for them.