Bible Reading: Chronicles

1 Chronicles 10:8-14, 11:1

And it came to pass on the morrow, when the Philistines came to strip the slain, that they found Saul and his sons fallen in mount Gilboa.
And when they had stripped him, they took his head, and his armor, and sent into the land of the Philistines round about, to carry tidings unto their idols, and to the people.
And they put his armor in the house of their gods, and fastened his head in the temple of Dagon.
And when all Jabesh-gilead heard all that the Philistines had done to Saul,
They arose, all the valiant men, 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.
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 inquire of it;
And inquired not of the Lord: therefore he slew him, and turned the kingdom unto David the son of Jesse.
Then all Israel gathered themselves to David unto Hebron, saying, Behold, we are thy bone and thy flesh.

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King Saul and his sons fell because he turned from God, who had given him all good, and not only disobeyed God, but sought power through idols and a witch's occult familiar.