Leviticus 14
4 Ref Then the priest is to give orders to take, for him who is to be made clean, two living clean birds and some cedar wood and red thread and hyssop.
5 Ref And the priest will give orders for one of the birds to be put to death in a vessel made of earth, over flowing water.
6 Ref And he will take the living bird and the wood and the red thread and the hyssop and put them in the blood of the bird which was put to death over flowing water.
7 Ref And shaking it seven times over the man who is to be made clean, he will say that he is clean and will let the living bird go free into the open country.