Leviticus 14:19, 20, 22

“Then the priest is to sacrifice the sin offering and make atonement for the one to be cleansed from their uncleanness. After that, the priest shall slaughter the burnt offering

and offer it on the altar, together with the grain offering, and make atonement for them, and they will be clean.

and two doves or two young pigeons, such as they can afford, one for a sin offering and the other for a burnt offering.