Leviticus 14:5 in the King James Version
And the priest shall command that one of the birds be killed in an earthen vessel over running water:
Context
4 then the priest shall command them to take for him who is to be cleansed two living clean birds, cedar wood, scarlet, and hyssop.
5 The priest shall command them to kill one of the birds in an earthen vessel over running water.
6 As for the living bird, he shall take it, the cedar wood, the scarlet, and the hyssop, and shall dip them and the living bird in the blood of the bird that was killed over the running water.