8 YHWH said to Moses and to Aaron, “Take handfuls of ashes of the furnace, and let Moses sprinkle it toward the sky in the sight of Pharaoh. 9 It shall become small dust over all the land of Egypt, and shall be boils and blisters breaking out on man and on animal, throughout all the land of Egypt.” Exodus 9:8-9WEB
This passage contains a positive command, with immediate application directed toward Moses, "Take handfuls of ashes of the furnace, and let Moses sprinkle it toward the sky in the sight of Pharaoh".
This command is part of the Principles and Definitions. It is relevant to an understanding of the distinctive role of Prophecy as Moses is relaying a message from God, and of Stewardship as God is commanding Pharaoh to relinquish God's possession Israel.
This command was fulfilled when Moses performed the act before Pharaoh in accordance with God's commands.