Deuteronomy 32:44

JOSHUA TAKES UP THE HISTORY.

(44) He, and Hoshea the son of Nun. — Why should Joshua be called Hoshea in this place? His name was apparently changed to Joshua at the time when he entered the promised land with the eleven others who searched it out (Numbers 13:8; Numbers 13:16). Now that he is about to lead Israel to the conquest, we are once more reminded of his change of name, and that the “salvation of Jehovah” was to be manifested through him. Possibly the change of name was also at this time confirmed to him. Compare the case of Jacob, whose change of name to Israel was twice made the subject of a Divine communication (Genesis 32:28; Genesis 35:10). Compare also what was said to him when about to enter into Egypt: “God spake unto Israel in the visions of the night, and said, Jacob, Jacob.”

We are assured by the mention of Hoshea in this place that the Joshua appointed to succeed Moses is the same person who was faithful among the spies.
It is also possible that this mention of Hoshea may be Joshua’s first mention of himself in the sacred writings. After the close of the song, the remainder of Deuteronomy is not covered by Moses’ signature. It belongs to Joshua, or else the author is unknown.