And Aaron's sons shall burn it on the altar
That is, the fat of the several parts before mentioned; this signified the sufferings of Christ, by which our peace is made, and by whose death we are reconciled to God: this rite of burning the fat of the inwards of sacrifices was used by the Pagans, and is still retained by the idolatrous Indians to this day F8:
upon the burnt sacrifice;
which, as Gersom says, was the burnt offering of the daily sacrifice of the morning, which was offered first of all sacrifices; so Jarchi says,
``we learn that the daily burnt offering preceded every other offering:''this was an eminent type of Christ's sacrifice:
which is upon the wood that [is] on the fire;
that is, which burnt offering was laid upon the wood on the fire, and the fat of the peace offering upon that:
F8 See the Abridgment of Mr. Brainerd's Journal, published in 1748, p. 30.