Leviticus 22:15-20 - Do not bring anything with a defect

22:15,16

The priests were responsible for making sure that the people did not eat the sacred offerings. This would desecrate the offerings, and bring guilt upon the people. Payment would be required in order to bring about restitution. Again, this is followed by the reminder that God is the Lord, and it is He who makes them holy. 

22:17,18a

We get the normal introduction. God speaks to Moses, and he, in turn, is to speak to Aaron and his sons. There is one change, this time he is also to speak to all Israel. The instructions about offerings in this section apply to all the people, they are not focused just on the priests.

22:18b-20

We start with burnt offerings. This is the first time that burnt offerings are spoken about in the context of freewill offerings, or to fulfil a vow. The emphasis here is on the requirement that the offered animal be without defect. This applied to Israelites and foreigners who were living in the land. The offering must be perfect. Christ is the only truly perfect sacrifice.