Левит 6:12

The fire of the altar was also to be kept burning "with it" (בּו, viz., the burnt-offering) the whole day through without going out. For this purpose the priest was to burn wood upon it (the altar-fire), and lay the burnt-offering in order upon it, and cause the fat portions of the peace-offerings to ascend in smoke, - that is to say, whenever peace-offerings were brought, for they were not prescribed for every day.

The first seven verses of this chapter might fitly have been added to the foregoing chapter, being a continuation of the law of the trespass-offering, and the putting of other cases in which it was to be offered; and with this end the instructions God gave concerning the several kinds of sacrifices that should be offered: and then at Lev 6:8 (which in the original begins a new section of the law) he comes to appoint the several rites and ceremonies concerning these sacrifices which had not been mentioned before. I. The burnt-offering (Lev 6:8-13). II. The meat-offering (Lev 6:11-18), particularly that at the consecration of the priest (Lev 6:19-23). III. The sin-offering (Lev 6:24, etc.).

6:12-13 This passage cautions that the fire on the bronze altar must be constantly tended and never allowed to go out, perhaps anticipating the tragedy of the “wrong kind of fire” offered by Nadab and Abihu (10:1-2).