These two phrases share similar meanings and emphasize complete destruction. (See: [[rc://en/ta/man/translate/figs-parallelism]])
# He left nothing undone of all that Yahweh commanded Moses to do
This negative phrase emphasizes that Joshua did everything that Yahweh commanded. AT: "Joshua did everything that Yahweh commanded" (See: [[rc://en/ta/man/translate/figs-litotes]])