Who is the "Israel of God" (Gal 6.16)?

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At the end of Galatians, Paul writes: “As for those who will follow this rule -- peace be upon them, and mercy, and upon the Israel of God” (Gal 6:16). Interpreters have been perplexed as to whether Paul’s reference to the “Israel of God” refers to the Jews, Jewish Christians, or is a circumlocution for the church comprise…