Leviticus 14:19

14:19 “The priest must then perform the sin offering and make atonement for the one being cleansed from his impurity. After that he is to slaughter the burnt offering,

Leviticus 14:31

14:31 a sin offering and the other a burnt offering along with the grain offering. So the priest is to make atonement for the one being cleansed before the Lord.