The priest shall burn all on the altar, etc. The fourth and last part of the sacrifice. The word employed is not the common term used for destroying by fire, but means "make to ascend." The life of the animal has already been offered in the blood; now the whole of its substance is "made to ascend" to the Lord.
Modern science, by showing that the effect of fire upon the substance of a body is to resolve it into gases which rise from it, contributes a new illustration to the verse. The vapour that ascends is not something different from that which is burnt, but the very thing itself, its essence; which, having ascended, is of a sweet savour unto the Lord, that is, acceptable and well-pleasing to him.
The burnt offering, the meat offering, and the peace offering, are sacrifices of sweet savour (Leviticus 2:2; Leviticus 3:5); the expression is not used with regard to the sin offering and trespass offering.
St. Paul applies it to the sacrifice of Christ, in Ephesians 5:2, "As Christ also loved us, and gave himself for us an offering and a sacrifice to God for a sweet-smelling savour;" thus indicating, in an incidental manner, the connection between the Jewish sacrifices and the sacrifice of Christ, as type and antitype.