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Textual criticism also produces a noteworthy observation concerning Leviticus 12. This brief chapter concerns the ritual of purification after childbirth, which is strikingly similar to the rituals for purification after menstruation, and other bodily discharges (bleeding, pus, vomit, etc.), at the end of Leviticus 15. Both, for example, involve "two turtledoves, or two young pigeons" brought to a priest, one for a "sin offering" and the other for a "burnt offering", on the eighth day. According to textual criticism, the writing style, vocabulary, and so forth, is also indicative of a single author for the two chapters. Consequently, most biblical critics view Leviticus 12 as originally belonging immediately after Leviticus 15:30, as Leviticus 15 has the structure of discussion on male non-sexual discharges, followed by discussion on male sexual discharges (semen), followed by discussion on female non-sexual discharges, and thus Leviticus 12 completes the pattern, as it discusses childbirth, which can be viewed as sexually connected (conception) discharge (of a baby) by a female. Although there is not complete agreement about why this Chapter was moved, the currently most prominent reason given is that, at a later point in time, the view of childbirth changed, and it was no longer viewed as a sexual discharge.