Here the word "hand" refers to Moses himself. Yahweh used Moses as the agent to deliver his command. This can be translated in active form. Alternate translation: "to obey all of the commands that Yahweh gave to the people through Moses" or "to do everything that Yahweh commanded Moses to tell the people" (See: [[rc://en/ta/man/translate/figs-synecdoche]] and [[rc://en/ta/man/translate/figs-activepassive]])