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

4 Maccabees 15:20

When thou didst see children's flesh heaped upon children's flesh that had been torn off, hands upon hands cut off, heads decapitated upon heads, dead falling upon the dead, and a choir of children turned through torture into a burying-ground, thou lamentedst not.

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