What the Bible says about Purification for Service to God
(From Forerunner Commentary)

Exodus 29:10 The Aaronic priests were purified for service to God through the transferal of their sins to a bull. Similarly, when an Israelite presented a peace or a sin offering, he laid his hands upon the animal being offered, identifying himself with it and transferring his guilt to the animal. Thus, the animal was set apart by God through the laying on of hands. Martin G. Collins Basic Doctrines: The Laying On of Hands Related Topics: Aaronic Priesthood | Animal Sacrifices | Laying On of Hands | Peace Offering | Sin Offering | Transferring of Guilt