Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
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Amos 8:10

I will turn your feasts into mourning, and all your songs into lamentation; and I will make you wear sackcloth on all your bodies, and baldness on every head. I will make it like the mourning for an only son, and its end like a bitter day.

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