Here, I. From the triumph of the Philistines over the body of Saul we may learn, 1. That the greater dignity men are advanced to the greater disgrace they are in danger of falling into. Saul's dead body, because he was king, was abused more than any other of the slain. Advancement makes men a mark for malice. 2. That, if we give not to God the glory of our successes, even the Philistines will rise up in judgment against us and condemn us; for, when they had obtained a victory over Saul, they sent tidings to their idols - poor idols, that knew not what was done a few miles off till the tidings were brought to them, nor then either! They also put Saul's armour in the house of their gods, Ch1 10:10. Shall Dagon have so honourable a share in their triumphs and the true and living God be forgotten in ours?
II. From the triumph of the men of Jabesh-Gilead in the rescue of the bodies of Saul and his sons we learn that there is a respect due to the remains of the deceased, especially of deceased princes. We are not to enquire concerning the eternal state; that must be left to God: but we must treat the dead body as those who remember it has been united to an immortal soul and must be so again.
III. From the triumphs of divine Justice in the ruin of Saul we may learn, 1. That the sin of sinners will certainly find them out, sooner or later: Saul died for his transgression. 2. That no man's greatness can exempt him from the judgments of God. 3. Disobedience is a killing thing. Saul died for not keeping the word of the Lord, by which he was ordered to destroy the Amalekites. 4. Consulting with witches is a sin that fills the measure of iniquity as soon as any thing. Saul enquired of one that had a familiar spirit, and enquired not of the Lord, therefore he slew him, Ch1 10:13, Ch1 10:14. Saul slew himself, and yet it is said, God slew him. What is done by wicked hands is yet done by the determinate counsel and foreknowledge of God. Those that abandon themselves to the devil shall be abandoned to him; so shall their doom be. It is said (Sa1 28:6) that Saul did enquire of the Lord and he answered him not: but here it is said, Saul did not enquire of God; for he did not till he was brought to the last extremity, and then it was too late.

So Saul died - and all his house - Every branch of his family that had followed him to the war was cut off; his three sons are mentioned as being the chief. No doubt all his officers were slain.

See Gill on Sa1 31:1.
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1 Chronicles 10:13

ch1 10:13
ch1 10:13
ch1 10:13So Saul died for his transgression,.... See Gill on Sa1 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, Sa1 13:13.

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, Sa1 28:8 which to do was contrary to an express command of God, Lev 19:31.

Saul died, and his three sons, and all his house--his sons and courtiers who were there engaged in the battle. But it appears that Ish-bosheth and Mephibosheth were kept at Gibeah on account of their youth.