Leviticus 14:7, 16, 51

The priest will then sprinkle the blood of the dead bird seven times on the person being purified of the skin disease. When the priest has purified the person, he will release the live bird in the open field to fly away.

He will dip his right finger into the oil in his palm and sprinkle some of it with his finger seven times before the LORD.

He will take the cedar stick, the hyssop branch, the scarlet yarn, and the live bird, and dip them into the blood of the slaughtered bird and into the fresh water. Then he will sprinkle the house seven times.