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

1 Samuel 17:3

And the Philistines stand on the mountain on one side, and Israel stands on the mountain on the other side, and the valley was between them.

Read in other translations

LXXLXX2012KJVWEB
Full Chapter 17Compare Translations