1 Samuel 14:1-3

Later that day, Jonathan, Saul’s son, said to his armor bearer, “Come on, let’s go over to the Philistine garrison patrol on the other side of the pass.” But he didn’t tell his father. Meanwhile, Saul was taking it easy under the pomegranate tree at the threshing floor on the edge of town at Geba (Gibeah). There were about six hundred men with him. Ahijah, wearing the priestly Ephod, was also there. (Ahijah was the son of Ahitub, brother of Ichabod, son of Phinehas, who was the son of Eli the priest of GOD at Shiloh.) No one there knew that Jonathan had gone off.