Joshua 8:32

And he wrote there upon the stones a copy of the law of
Moses
Not upon the stones of which the altar was made, though some have so thought; but upon other stones erected in the form of a pillar, and plastered over, ( Deuteronomy 27:4 ) ; which copy of the law was not the whole book of Deuteronomy, as some, at least only an abstract of the laws in it; but rather the decalogue, as Abarbinel; or the blessings and curses later read, as Ben Gersom:

which he wrote in the presence of the children of Israel:
they being witness of it, that he did what was enjoined.