1 Samuel 13:1-4

Saul was thirty years old when he began to reign, and he reigned for forty-two years over Israel.

Now Saul chose for himself three thousand men of Israel, of whom two thousand were with Saul in Michmash and in the hill country of Bethel, while a thousand were with Jonathan at Gibeah of Benjamin. But he sent the rest of the people away, each to his tent.

And Jonathan attacked the garrison of the Philistines that was in Geba, and the Philistines heard about it. Then Saul blew the trumpet throughout the land, saying, “Let the Hebrews hear!”

And all Israel heard the news that Saul had attacked the garrison of the Philistines, and also that Israel had become repulsive to the Philistines. Then the people were summoned to Saul at Gilgal.