Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
LXX

Amos 1:13

Thus saith the Lord; For three sins of the children of Ammon, and for four, I will not turn away from him; because they ripped up the women with child of the Galaadites, that they might widen their coasts.

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