Rashi on Leviticus 9:11/רש"י על ויקרא ט׳:י״א

1'ואת הבשר ואת העור וגו‏‎‎ AND THE FLESH AND THE HIDE [HE BURNT .. OUTSIDE THE CAMP] — We do not find that any “external” sin-offering (one the blood of which was sprinkled on the outer altar) was burnt except this and that of the installation ceremony — and all these, only at the express command of God (cf. Rashi on Exodus 29:14).