Joshua 1:1 - Clarke's commentary and critical notes on the Bible

Now after the death of Moses the servant of the LORD it came to pass, that the LORD spake unto Joshua the son of Nun, Moses' minister, saying, Now after the death of Moses - ויהי vayehi, and it was or happened after the death of Moses. Even the first words in this book show it to be a continuation of the preceding, and intimately connected with the narrative in the last chapter in Deuteronomy, of which I suppose Joshua to have been the author, and that chapter to have originally made the commencement of this book, Deuteronomy 34:1-12 (note). The time referred to here must have been at the conclusion of the thirty days in which they mourned for Moses.