Numbers 17:11

And Moses said to Aaron, Take a censer, and put on it fire from the altar, and put incense on it, and carry it away quickly into the camp, and make atonement for them; for wrath is gone forth from the presence of the Lord, it has begun to destroy the people.

And Moses and Aaron did as the Lord commanded Moses, so did they.

Moses did so. As Yahweh commanded him, so he did.