1 Samuel 13:1-3

1Saul was...years old when he became king; and he reigned two years over Israel.

2And Saul chose him three thousand men out of Israel: there were with Saul two thousand in Michmash and in mount Bethel, and a thousand were with Jonathan in Gibeah of Benjamin; and the rest of the people he sent every man to his tent.

3And Jonathan smote the outpost of the Philistines that was in Geba, and the Philistines heard [of it]. And Saul blew the trumpet throughout the land, saying, Let the Hebrews hear.