1 Chronicles 10:12-14

Young's Literal Translation

¹² and all the men of valour rise and bear away the body of Saul, and the bodies of his sons, and bring them in to Jabesh, and bury their bones under the oak in Jabesh, and fast seven days.

¹³ And Saul dieth because of his trespass that he trespassed against Jehovah, against the word of Jehovah that he kept not, and also for asking at a familiar spirit -- to inquire, --

¹⁴ and he inquired not at Jehovah, and He putteth him to death, and turneth round the kingdom to David son of Jesse.