Leviticus 14:31-33

³¹of the kind he is able to afford, the one for a sin offering, and the other for a burnt offering, with the meal offering. The priest shall make atonement for him who is to be cleansed before Yahweh.”

³²This is the law for him in whom is the plague of leprosy, who is not able to afford the sacrifice for his cleansing.

³³Yahweh spoke to Moses and to Aaron, saying,