Leviticus 12:6

And when the days of her purifying are fulfilled, for a son, or for a daughter, she shall bring a lamb of the first year for a burnt offering, and a young pigeon, or a turtledove, for a sin offering, unto the door of the tabernacle of the congregation, unto the priest:

Ver. 6. And when the days of her purifying.] The Virgin Mary also observed this law, Luk 2:21 not in conscience of any particular sin, which in the conception of our Saviour she was free from; nor in show, to satisfy the law, much less upon hypocrisy; but in conscience of her natural corruption, which by this oblation, according to the law, she did confess holily and religiously before God and his congregation, as one well observeth.