The peace-offerings were not to make propitiation either. It was communion in joy together, not simply priestly with the Lord.
The fat of the peace-offerings was burned on the burnt-offering, consumed with the burnt-offering. Compare chapter 6:11.
5. This connected the peace-offering with the burnt-sacrifice.
9. In the peace-offering, when it was a lamb, the whole rump was burned; I know not whether it was an intentional difference-the sin-offerings always refer to the fat of the peace-offerings taken away; compare verses 3, 4.
It is developed in verse 16.