1 Chronicles 10:13 in the King James Version
So Saul died for his transgression which he committed against the LORD, even against the word of the LORD, which he kept not, and also for asking counsel of one that had a familiar spirit, to enquire of it;
Context
12 all the valiant men arose and took away the body of Saul and the bodies of his sons, and brought them to Jabesh, and buried their bones under the oak in Jabesh, and fasted seven days.
13 So Saul died for his trespass which he committed against the LORD, because of the LORD’s word, which he didn’t keep, and also because he asked counsel of one who had a familiar spirit, to inquire,
14 and didn’t inquire of the LORD. Therefore he killed him, and turned the kingdom over to David the son of Jesse.