Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
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Amos 1:8

I will cut off the inhabitant from Ashdod, and him who holds the scepter from Ashkelon; and I will turn my hand against Ekron; and the remnant of the Philistines will perish,” says the Lord Yahweh.

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