Leviticus 21-22

Priests must marry virgins, and not touch dead bodies unless its immediate family.  Priests with physical defects may not go into the temple to offer sacrifice.  I wasn't sure if this forbids animal sacrifice on the bronze altar, or just going into the holy place to lay out bread and offer incense, until I read 22:25, which calls animal sacrifices the bread of God.

Priests may not eat of the holy food while unclean or diseased, nor eat unclean food ever.
The holy food is for the priest and his immediate family, not guests or even children that leave the home.
No sacrifice may be blemished.  Newborn animals can't be sacrificed until the 8th day.

How this is about Jesus

Jesus our great high priest was pure in all ways, a clean, acceptable and pleasing mediator between God and man.

Sins this may reveal

Skimping on tithing; offering God the throw-aways of our goods, the cheapest possible.

I am the Lord who sanctifies you, 33 who brought you out of the land of Egypt to be your God: I am the Lord.”  Leviticus 22:32-33