Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
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Joshua 12:2

Sihon king of the Amorites, who lived in Heshbon, and ruled from Aroer, which is on the edge of the valley of the Arnon, and the middle of the valley, and half Gilead, even to the river Jabbok, the border of the children of Ammon;

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