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

1 Samuel 20:30

And Saul was exceedingly angry with Jonathan, and said to him, Thou son of traitorous damsels! for do I not know that thou art an accomplice with the son of Jessæ to thy shame, and to the shame of thy mother's nakedness?

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