1 Samuel 14:21-22

21Now the Hebrews that were with the Philistines as beforetime, which went up with them into the camp from the country round about; even they also turned to be with the Israelites that were with Saul and Jonathan.

22Likewise all the men of Israel which had hid themselves in the hill country of Ephraim, when they heard that the Philistines fled, even they also followed hard after them in the battle.