Leviticus 3:3

3. The fat The suet or sweet fat is here described. The fat diffused through the flesh it was lawful to eat. The suet was forbidden food.

Leviticus 7:23. The burning of the suet is particularly specified in every kind of offering of a victim. Whatever was reserved for the priest, or to the offerer, the suet must always be burned. The reason may be, because this is the best portion. Murphy assigns another reason: “The fat is expressive of the holiness which pertains to the Substitute, as the blood is significant of the penal death which He has undertaken to suffer. The two go to make up what is called righteousness, or active and passive obedience to the law for the sinner.” We see no semblance between fat and holiness which can make one a fitting type of the other except their purity and unmingled nature. See Concluding Note.