This account of Saul's death is the same with that which we had, Sa1 31:1, etc. We need not repeat the exposition of it. Only let us observe, 1. Princes sin and the people suffer for it. It was a bad time with Israel when they fled before the Philistines and fell down slain (Ch1 10:1), when they quitted their cities, and the Philistines came and dwelt in them, Ch1 10:7. We do not find that they were at this time guilty of idolatry, as they had been before, in the days of the judges, and were afterwards, in the days of the kings. Samuel had reformed them, and they were reformed: and yet they are thus given to the spoil and to the robbers. No doubt there was enough in them to deserve this judgment; but that which divine Justice had chiefly an eye to was the sin of Saul. Note, Princes and great men should in a special manner take heed of provoking God's wrath; for, if they kindle that fire, they know not how many may be consumed by it for their sakes. 2. Parents sin and the children suffer for it. When the measure of Saul's iniquity was full, and his day came to fall (which David foresaw, Sa1 26:10), he not only descended into battle and perished himself, but his sons (all but Ishbosheth) perished with him, and Jonathan among the rest, that gracious, generous man; for all things come alike to all. Thus was the iniquity of the fathers visited upon the children, and they fell as parts of the condemned father. Note, Those that love their seed must leave their sins, lest they perish not alone in their iniquity, but bring ruin on their families with themselves, or entail a curse upon them when they are gone. 3. Sinners sin and at length suffer for it themselves, though they be long reprieved; for, although sentence be not executed speedily, it will be executed. It was so upon Saul; and the manner of his fall was such as, in various particulars, answered to his sin. (1.) He had thrown a javelin more than once at David, and missed him; but the archers hit him, and he was wounded of the archers. (2.) He had commanded Doeg to slay the priests of the Lord; and now, in despair, he commands his armour-bearer to draw his sword and thrust him through. (3.) He had disobeyed the command of God in not destroying the Amalekites, and his armour-bearer disobeys him in not destroying him. (4.) He that was the murderer of the priests is justly left to himself to be his own murderer; and his family is cut off who cut off the city of the priests. See, and say, The Lord is righteous.

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.