The priest will offer one of the birds as a sacrifice for sin and the other as a sacrifice to please me, then I will consider the man completely clean.
After the ceremony, the priest is to take a bath and wash his clothes. Only then can he go back into the camp, but he remains unclean and unfit for worship until evening.
He saved us because of his mercy, and not because of any good things that we have done. God washed us by the power of the Holy Spirit. He gave us new birth and a fresh beginning.