The fire on the altar shall be kept burning on it; it shall not go out. The priest shall burn wood on it every morning, and he shall arrange the burnt offering on it and shall burn on it the fat of the peace offerings.
Hitherto we have had the instructions which Moses was directed to give to the people concerning the sacrifices; but here begin the instructions he was to give to the priests; he must command Aaron and his sons, Lev 6:9. The priests were rulers in the house of God, but these rulers must be ruled; and those that had the command of others must themselves be commanded.
Commenting on Leviticus 6:8-13
And the fire upon the altar shall be burning in it, it shall not be put out,.... There were three fires, or piles of wood for fire continually; the first was a large one, on which the daily sacrifice was burnt; the second less, and called the pile of the incense, because they took from it fire in a censer to burn the morning and...
Lev 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...