21 And after eight days were accomplished, that the child should be circumcised, his name was called JESUS, which was called by the angel, before he was conceived in the womb.
22 And after the days of her purification, according to the law of Moses, were accomplished, they carried him to Jerusalem, to present him to the Lord:
23 As it is written in the law of the Lord: Every male opening the womb shall be called holy to the Lord:
24 And to offer a sacrifice, according as it is written in the law of the Lord, a pair of turtledoves, or two young pigeons:
(Luk 2:21-24 DRA)
One of the turtledoves is a sin offering
`And if she is not able to bring a lamb, then she may bring two turtledoves or two young pigeons one as a burnt offering and the other as a sin offering. So the priest shall make atonement for her, and she will be clean. " -Lev 12:8 NKJ
If Mary were sinless, then a turtledove offering is vanity, hypocritical.