1 Chronicles 10:13

13 So Sha'ul died for his trespass which he committed against the LORD, because of the word of the LORD, which he didn't keep; and also because he asked counsel of one who had a familiar spirit, to inquire [thereby],

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 When all Yavesh-Gil`ad heard all that the Pelishtim had done to Sha'ul,

12 all the valiant men arose, and took away the body of Sha'ul, and the bodies of his sons, and brought them to Yavesh, and buried their bones under the oak in Yavesh, and fasted seven days.

13 So Sha'ul died for his trespass which he committed against the LORD, because of the word of the LORD, which he didn't keep; and also because he asked counsel of one who had a familiar spirit, to inquire [thereby],

14 and didn't inquire of the LORD: therefore he killed him, and turned the kingdom to David the son of Yishai.