The birds in a nest can be either pigeons or doves, but both must be of the same species. The two birds are sacrificed in different ways: One is a burnt offering, which means that its blood is sprinkled on the lower half of the altar, and the other is a sin offering, whose blood is sprinkled on the upper half. The woman bringing the sacrifice can either designate which bird is for which purpose or she can leave them undesignated, so that it’s up to the priest to decide.Earlier Daf Yomi columns are noted here and links.
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