>> “i said i would be praying for those who reject the new covenant in his blood and still think they can be justified by keeping the law of Moses” <<
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That is a non-existent class, except for a portion of the catholic church.
First, the covenant was RE-NEWED in his blood, the only change being the shedding of his sinless blood.
Second, there has never been anyone that had expectation of JUSTIFICATION by the law. Justification has always been foreward looking since Adam, has always been a matter of grace, through faith sufficient to endure to the end in the righteousness obtained in edification through Torah, the law of love.
This is what Peter’s, John’s and James epistles were written to tell us. Paul’s epistles also tell us this, but many get lost in his long sentences, and side explanations, and never are able to put a cogent thought together from them.
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there had to be a new covenant, since the old covenant was FULFILLED.
Jesus Christ fulfilled the old covenant and this qualified him to be the mediator of the New Covenant, a Covenant sealed by the shedding of His blood for the remission of sins.