"And if the entire congregation of Israel commits an unintentional sin and [the truth] is hidden from the eyes of the assembly"—Leviticus 4:13.
A rabbinic court that erroneously issues an incorrect halachic verdict is required to bring a sacrifice.
"But if she is cleansed from her discharge... on the eighth day, she shall take for herself two turtledoves..."—Leviticus 15:28-29.
A woman who is a zavah [one who experiences menses three consecutive days outside the normal menstrual period] must, after the disorder has been cured, bring an offering—two pigeons or two turtledoves.
Until she brings this offering, her purification process is not complete and she may not partake of sacrificial flesh.
"And when the days of her purification period are fulfilled, for a son or for a daughter, she shall bring a sheep within its first year of age..."—Leviticus 12:6.
A woman who gives birth is required to bring an offering—a sheep for a Burnt Offering and a pigeon or turtledove as a Sin Offering. If she is of limited financial means, she may instead bring two pigeons or two turtledoves, one as a Burnt Offering and one as a Sin Offering.
Until she brings this offering, her purification process is not complete and she may not partake of sacrificial flesh.