Exodus 30:9

9. Strange incense Offered with fire other than that which God ordained, on account of which impiety the two elder sons of Aaron were destroyed . Leviticus 10:1. This altar of incense being set apart for a special use, no burnt sacrifice, nor meat offering, nor drink offering, was to be offered thereon . The offerings made on the great altar, in the court without, effected reconciliation with Jehovah; the incense offering represented a closer approach to the divine glory, based upon previous reconciliation; and hence a bringing of the same offerings within, before the vail, as those offered without, would have been a confusion of distinct symbolical services .