9 Then from the sacrifice of the peace offering as an offering by fire to the Lord he shall offer its fat, the fat tail entire, taking it away close by the backbone, and the fat that covers the entrails, and all the fat that is on the entrails, 10 and the two kidneys with the fat that is on them at the loins, and the appendage of the liver which he shall take away with the kidneys. 11 And the priest shall burn it on the altar as food offered by fire to the Lord.
Matthew Henry's Commentary on Leviticus 3:9-11
Commentary on Leviticus 3:6-17
(Read Leviticus 3:6-17)
Here is a law that they should eat neither fat nor blood. As for the fat, it means the fat of the inwards, the suet. The blood was forbidden for the same reason; because it was God's part of every sacrifice. God would not permit the blood that made atonement to be used as a common thing, Hebrews 10:29; nor will he allow us, though we have the comfort of the atonement made, to claim for ourselves any share in the honour of making it. This taught the Jews to observe distinction between common and sacred things; it kept them separate from idolaters. It would impress them more deeply with the belief of some important mystery in the shedding of the blood and the burning the fat of their solemn sacrifices. Christ, as the Prince of peace, "made peace with the blood of his cross." Through him the believer is reconciled to God; and having the peace of God in his heart, he is disposed to follow peace with all men. May the Lord multiply grace, mercy, and peace, to all who desire to bear the Christian character.