What does 2 Samuel 23:13 mean?

And three of the thirty chief men went down, and came to David in the harvest time unto the cave of Adullam; and the troop of the Philistines was encamped in the valley of Rephaim.

And three of the thirty chief went down, and came to David in the harvest time unto the cave of Adullam: and the troop of the Philistines pitched in the valley of Rephaim.

And three of the thirty chief men went down, and came to David in the harvest time unto the cave of Adullam; and the troop of the Philistines was encamped in the valley of Rephaim.

And three of the thirty went down at the start of the grain-cutting, and they came to David at the strong place of Adullam; and the band of Philistines had taken up their position in the valley of Rephaim.

And three of the thirty heads go down and come unto the harvest, unto David, unto the cave of Adullam, and the company of the Philistines are encamping in the valley of Rephaim,

Moreover also before this the three who were princes among the thirty, went down and came to David in the harvest time into the cave of Odollam: and the camp of the Philistines was in the valley of the giants.

And three of the thirty chiefs went down, and came to David in the harvest time to the cave of Adullam, when the troop of the Philistines was encamped in the valley of Rephaim.