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

1 Samuel 17:8

And he stood and cried to the army of Israel, and said to them, Why are ye come forth to set yourselves in battle array against us? Am not I a Philistine, and ye Hebrews of Saul? choose for yourselves a man, and let him come down to me.

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