Leviticus 15:28-30

28 But a if she is cleansed of her discharge, she shall count for herself seven days, and after that she shall be clean. 29 And on the eighth day she shall take two b turtledoves or two pigeons and bring them to the priest, to the entrance of the tent of meeting. 30 And the priest shall use one for a sin offering and the other for a burnt offering. And the priest shall make atonement for her before the  Lord for her unclean discharge.

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