1 Chronicles 10:12-16

all the valiant men got up and took away the body of Saul and the bodies of his sons, and brought them to Jabesh; and they buried their bones under the oak in Jabesh, and fasted for seven days.

So Saul died for his unfaithfulness which he committed against the Lord, because of the word of the Lord which he did not keep; and also because he asked counsel of a medium, making inquiry of her,

and did not inquire of the Lord. Therefore He killed him and turned the kingdom over to David, the son of Jesse.