1 Samuel 14:21-22

21Now the Hebrews who were with the Philistines previously, who went up with them all around in the camp, even 1they also turned to be with the Israelites who were with Saul and Jonathan.

22When all the 2men of Israel who had hidden themselves in the hill country of Ephraim heard that the Philistines had fled, even they also pursued them closely in the battle.