Where did Moshe come from?
Since when was Yehoshua a partner of Moshe Rabeinu?
Bearing in mind that Moshe had already changed Hoshe'a's name to Yehoshua, why does the Torah call him Hoshe'a?
Rashi: To teach us that his new appointment did not go to his head and he remained as humble as he had been before.
Hadar Zekenim, Rosh: As long as he served Moshe, it was proper to call him by the name that Moshe called him. Here it calls him by his [initial] name. Everywhere [after this] he is called Yehoshua, for he was used to this [name].
Ha'amek Davar: Moshe recited Ha'azinu, and when he came to explain it, the Shechinah did not speak from his throat, so Yehoshua helped him through Moshe's Shelichus. He is called Hoshe'a because he did not do so as Yehoshua, the Rebbi of Yisrael [after Moshe], rather, as Hoshe'a, Moshe's Talmid.
QUESTIONS ON RASHI
Rashi writes that it was the Shabbos of Deyugazi. What is this?
Riva: Deyo is two. There were two kingships