Ezekiel 43:21

Thou shalt take the bullock also of the sin offering
Which was appointed for the sin offering, according to the divine direction, ( Ezekiel 43:19 ) , the prophet was to take it out of the herd, and separate it from the rest for this purpose, and deliver it into the hands of one of the priests: and he shall burn it in the appointed place of the house;
that is, one of the sons of Zadok should receive it of the prophet, and burn it in its proper place; not within the house, without the court, but within the wall of the house: this burning of it was typical of the dolorous sufferings of Christ; (See Gill on Ezekiel 40:39), or of the zeal and fervency of the ministers of the Gospel, in preaching a crucified Christ in the proper place, in the house and church of God: without the sanctuary; the holy place or temple, properly so called; or without the camp, typical of Christ's suffering without Jerusalem, and of his being preached not only there, but in the Gentile world; see ( Hebrews 13:11 Hebrews 13:12 ) , this was the work of the first day of the consecration of the altar.