Four lack atonement [offerings], and four bring [offerings] for intentional as well as inadvertent transgression. These are the ones who lack atonement [offerings]: the zav, the zavah, the woman who has given birth, and the metzora. R’ Eliezer ben Yaakov says: A proselyte [too] lacks atonement until the blood is sprinkled for him, and [so does] a nazir for his wine, his haircutting, and his tumah.