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The term “The Law of Moses” is used interchangeably for both Torah, and the Pharisees Takanot and Ma’assim in the Greek translations.
They were obviously translated by someone not knowledgeable in the Judaic culture. They are peppered with hundreds of such cultural pitfalls.
Understanding simply requires careful reading, and remembering what is established in each epistle, and understanding that the word of God has no contradictions.
Romans clearly states that “Doers of the law will be justified.” The epistles clearly record that they kept every Sabbath, and every appointed time.
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Paul's Talmudic understanding and the Word of G_d are sometimes two different things, and I can prove it.