Which was ordained in mount Sinai... Or, which was offered (Hebrew, made) in Mount Sinai. Ibn Ezra adduces this passage as a proof that the Israelites ceased to offer burnt sacrifices after they left the encampment at Sinai throughout the time of their wanderings in the wilderness.
Related Commentaries of Numbers 28:6
Numbers 28:6
6 It is a continual burnt offering, which was ordained in mount Sinai for a sweet savour, a sacrifice made by fire unto the LORD.