12 The fire on the altar shall be kept burning on it, it shall not go out; and the priest shall burn wood on it every morning: and he shall lay the burnt offering in order upon it, and shall burn on it the fat of the peace offerings.
*Minor differences ignored. Grouped by changes, with first version listed as example.
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 evening incense; and the third was only for preserving the fire that it might not go out: and of this it is written, Leviticus 6:12 (x); and Maimonides (y) observes, that some say, the first of these is meant by the burning all night, Leviticus 6:9 and the second by the fire of the altar burning in it, Leviticus 6:12 but his own sense is, the third is meant by it; and in the sense of R. Joses, these three fires were all burning upon the altar; the first was towards the east side of the altar, the second towards the southwest, as being nearer to the rise of the altar, where the priests were, and the third was made in any part of the altar as was thought fit (z); and this is the fire not to be put out, and he that quenched it, though but one coal, was to be beaten, yea, though it be brought down from the altar (a):
and the priest shall burn wood in it every morning: until the fourth hour of the day, according to the Targum of Jonathan; that is, unto ten o'clock in the morning:
and lay the burnt offering in order upon it; both morning and evening, and as often as any sacrifices of that kind were offered up:
and he shall burn thereon the fat of the peace offerings; that which was upon the inwards and covered them, and upon the kidneys, and flanks, and caul of the liver; see Leviticus 3:3.
(x) Maimon. Hilchot Tamidin, c. 2. sect. 4. Bartenora in Misn. Tamid, c. 2. sect. 4. & in Yoma, c. 4. sect. 6. (y) In ib. sect. 5. & in Yoma, c. 4. sect. 6. (z) Maimon. Hilchot Tamidin, c. 2. sect. 7, 8, 9. (a) Ibid. sect. 6.
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.
It shall not be put out - The fire coming down from heaven, was to be perpetually preserved, and not suffered to go out, partly that there might be no occasion or temptation to offer strange fire; and partly to teach them whence they were to expect the acceptance of all their sacrifices, even from the divine mercy, signified by the fire that came down from heaven which was an usual token of God's favourable acceptance. Every morning - Though the evening also be doubtless intended, yet the morning is only mentioned, because then the altar was cleansed, and the ashes taken away, and a new fire made. Thereon - Upon the burnt - offering, which thereby would be sooner consumed, that the way might be made for other sacrifices.
*More commentary available at chapter level.