Shared ground
Joshua 4:8–9 presents stone-setting as a public way to mark a decisive moment: Israel’s crossing of the Jordan. The text is explicit that the people carry twelve stones out of the river, matching the tribes, and place them at their lodging place. It is also explicit that Joshua sets up twelve stones “in the midst of the Jordan,” at the spot where the priests stood with the ark.
The passage also links human action to divine direction. The narrator says the people’s action matched what Yahweh had said to Joshua. This makes the stones more than travel rocks; they function as an intentionally ordered marker tied to Yahweh’s guidance.
Where interpretation differs
A real question is whether verse 9 describes a second stone set (one at the camp and another in the river) or is another way of describing the same twelve stones already mentioned in verse 8.
A second question is how to picture the phrase “in the midst of the Jordan,” especially given the note “they are there to this day.” Some think the river stones could still be seen (at least when water was low), while others think the point is that the location was remembered even if the stones were not normally visible.
Why the disagreement exists
Verse 8 and verse 9 both speak of “twelve stones,” but they describe different actions (the people carry and set down; Joshua sets up), and different locations (the lodging place; the riverbed where priests stood). Readers weigh these details differently. Also, “to this day” is a narrator’s later-time comment, but it does not specify how the stones remained known—by sight, by local memory, or by repeated retelling.
What this passage clearly contributes
Explicitly, the narrative highlights (1) obedience to Joshua’s command, (2) a twelve-tribe representation of “all Israel,” and (3) the centrality of the ark’s location (the priests’ standing place) in how the crossing is remembered. By inference from these explicit claims, the stones function as durable witnesses to a community-defining event and as a concrete way of tying Israel’s identity (“twelve tribes”) to Yahweh’s direction at the Jordan crossing.