Shared ground
This scene closes Ahithophel’s story and repositions the conflict for the next battle. The text explicitly presents Ahithophel’s suicide as a response to realizing his counsel was rejected, and it emphasizes his deliberate preparation beforehand (“set his house in order”) and his normal family burial (vv. 23).
It also explicitly shows the rebellion solidifying into organized warfare: David reaches Mahanaim while Absalom crosses the Jordan with broad support, Absalom replaces Joab with Amasa, and both sides establish camps in Gilead (vv. 24–26). Leadership, geography, and kinship ties are foregrounded as real forces shaping what happens next.
Where interpretation differs (only where needed)
Ahithophel’s motive for suicide. The text gives the trigger (his counsel not followed) but not a full inner explanation. Some read his act mainly as shame and loss of status; others as a cold calculation that Absalom’s cause is now doomed and he wants to avoid the fallout; others combine these (despair plus fear of consequences). All of these go beyond the explicit wording while trying to account for why the rejected counsel leads to immediate self-killing.
“All the men of Israel.” The phrase can be taken as literally every eligible man, or as a common way of saying “a very large, representative national force.” Either way, the narrative point is Absalom’s substantial mobilization as he crosses the Jordan (v. 24).
Why the disagreement exists
The passage reports actions more than motives. Ahithophel’s internal reasoning is not narrated, and “all the men of Israel” is the kind of broad language that can function either as a precise count-claim or a rhetorical summary.
What this passage clearly contributes
It contributes a stark link between political reversal and personal collapse: a key strategist exits the story by suicide once his influence breaks (v. 23). It also contributes a picture of how a civil war turns on logistics and leadership: safe locations (Mahanaim), major movements (crossing the Jordan), command decisions (Amasa replacing Joab), and camps in Gilead that set the stage for the coming clash (vv. 24–26). 2 Samuel 17:1–14 is the immediate setup that makes Ahithophel’s reaction intelligible.