English: “Upon the stones” — there were three kinds of stones: one that Moshe set up east of the Jordan, one that Yehoshua set up in the Jordan, and one that they set up on Mount Eival (and afterward brought to Gilgal).
In Sotah / Sifrei: The various mentions of stones are reconciled as three distinct stages of public inscription of the Torah — in Moav, in the Jordan, and on Har Eival.
Type of Learning
Custom (reconciliation of multiple stone-erections).
What Is Learned
The Torah was publicly written on stones at three stages of the entry into the Land.