Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
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Isaiah 40:9

You who tell good news to Zion, go up on a high mountain. You who tell good news to Jerusalem, lift up your voice with strength! Lift it up! Don’t be afraid! Say to the cities of Judah, “Behold, your God!”

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