Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
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Daniel 6:12

Then they came near, and spoke before the king concerning the king’s decree: “Haven’t you signed a decree that every man who makes a petition to any god or man within thirty days, except to you, O king, shall be cast into the den of lions?” The king answered, “This thing is true, according to the law of the Medes and Persians, which doesn’t alter.”

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