פירוש על דברים 31:11

תקרא את התורה הזאת [WHEN ALL ISRAEL IS COME TO APPEAR BEFORE THE LORD …] THOU SHALT READ THIS LAW [BEFORE ALL ISRAEL] — The king read from the beginning of the section “These are the words” (Deuteronomy 1:1), — as is set forth in Treatise Sotah 41a — upon a wooden platform that was erected in the forecourt.

תקרא את התורה הזאת, “you shall read out publicly this Torah;” this commandment was addressed to Joshua. This is why he is also referred to as the king.