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

1 Kings 15:27

And Baasa son of Achia, [who was] over the house of Belaan son of Achia, conspired against him, and smote him in Gabathon of the Philistines; for Nabat and all Israel were besieging Gabathon.

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