The answer is: 12

Josh 4:2-9 - One for each of the 12 tribes.

The act of collecting twelve stones from the Jordan River embodies more than just a strategic decision; it’s a rich symbolism of identity and unity among the Israelites. Each stone taken represents one of the twelve tribes of Israel, showcasing their shared heritage and spiritual journeys. These stones weren’t just for decoration; they served as a physical memorial, reminding future generations of God's miraculous provision when He parted the waters.

What’s fascinating is the significance of tangible monuments in the biblical tradition. For example, in ancient cultures, erecting stones (or altars) was common to mark significant events and pacts. Think of that age-old wedding tradition where some folks plant a tree or lay a brick in a newly built house—you literally have something to touch that communicates memories and commitments.

Moreover, Joshua’s choice to have people commemorate a pivotal moment also suggests an understanding of storytelling and memory preservation. Over time, it morphs into communal practices, like the Passover, where deeds are recalled annually, intertwining legacy with ritual.

Interestingly, perhaps this practice resonates with us today. The act of remembering signifies resilience and continuity. Just as those stones marked the ground, so do the stories we share and remember define who we truly are. It's a gentle reminder that even the smallest actions can carry immense meaning across generations, becoming the foundations of our collective narratives.