Leviticus 14:5

5 Then the priest shall order that one of the birds be killed over fresh water in a clay pot.

Read Leviticus 14:5 Using Other Translations

And the priest shall command that one of the birds be killed in an earthen vessel over running water:
And the priest shall command them to kill one of the birds in an earthenware vessel over fresh water.
The priest will order that one bird be slaughtered over a clay pot filled with fresh water.