The Parshah of Tazria continues the discussion of the laws of Tumah v'Taharah, ritual impurity and purity.
A woman giving birth should undergo a process of purification, which includes immersing in a mikvah (a naturally gathered pool of water) and bringing offerings to the Holy Temple. All male infants are to be circumcised on the eighth day of life.
Tzaraat ("leprosy") is a supra-natural plague, which also can afflict garments. If white or pink patches appear on a person's skin (dark red or green in garments), a Kohen is summoned. Judging by various signs, such as an increase in size of the afflicted area after a seven-day quarantine, the Kohen pronounces it tameh (impure) or tahor (pure).
A person afflicted with tzaraat must dwell alone outside of the camp (or city) until he is healed. The afflicted area in a garment is removed; if the tzaraat spreads or recurs, the entire garment must be burned.
This being the Shabbat that falls on or before the 1st of Nissan, we also read the section of Hachodesh (Exodus 12:1-20) which relates G-d's words to Moses in Egypt two weeks before the Exodus, instructing us to set the Jewish calendar by the monthly new moon and to regard Nissan as the "head of months." G-d also instructs to bring the Passover offering, to eat it with matzah and bitter herbs, and to abstain from leaven for seven days.
