Leviticus 14:48-53

48“But if the priest returns for his inspection and finds that the mildew has not reappeared in the house after the fresh plastering, he will pronounce it clean because the mildew is clearly gone.

49To purify the house the priest must take two birds, a stick of cedar, some scarlet yarn, and a hyssop branch.

50He will slaughter one of the birds over a clay pot filled with fresh water.

51He 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.

52When the priest has purified the house in exactly this way,

53he will release the live bird in the open fields outside the town. Through this process, the priest will purify the house, and it will be ceremonially clean.