1 Chronicles 10:13

13 So Saul died because he was unfaithful to the LORD . He failed to obey the LORD ’s command, and he even consulted a medium

1 Chronicles 10:13 Meaning and Commentary

1 Chronicles 10:13

So Saul died for his transgression
(See Gill on 1 Samuel 31:13) A violent and dishonourable death, which was suffered on account of the sins he was guilty of:

one was, which he committed against the Lord, even against the word of
the Lord, which he kept not;
both in not staying for Samuel the time appointed, and by sparing the Amalekites whom he was bid to destroy, ( 1 Samuel 13:13 1 Samuel 13:14 ) ( 1 Samuel 15:3 1 Samuel 15:9 )

and also for asking counsel of one that had a familiar spirit, to
inquire of it;
what he should do with respect to engaging in battle with the Philistines, ( 1 Samuel 28:8 1 Samuel 28:15 ) which to do was contrary to an express command of God, ( Leviticus 19:31 ) .

1 Chronicles 10:13 In-Context

11 But when everyone in Jabesh-gilead heard about everything the Philistines had done to Saul,

12 all their mighty warriors brought the bodies of Saul and his sons back to Jabesh. Then they buried their bones beneath the great tree at Jabesh, and they fasted for seven days.

13 So Saul died because he was unfaithful to the LORD . He failed to obey the LORD ’s command, and he even consulted a medium

14 instead of asking the LORD for guidance. So the LORD killed him and turned the kingdom over to David son of Jesse.