And if she be not able to bring a lamb, then she shall bring two turtledoves, or two young pigeons; the one for the burnt offering, and the other for a sin offering: and the priest shall make an atonement for her, and she shall be clean.
Read Chapter 12
Bede
AD 735
The Lord commanded in the law that those who could were to offer a lamb for a son or a daughter, along with a turtledove or a pigeon. But one who did not have sufficient wealth to offer a lamb should offer two turtledoves or two young pigeons. Therefore, the Lord, mindful in everything of our salvation, not only deigned for our sake to become a human being, though he was God, but also he deigned to become poor for us, though he was rich, so that by his poverty along with his humanity he might grant us to become sharers in his riches and his divinity.
Lamb. This was the case of the blessed Virgin Mary: (Luke ii. 24,); so poor was she! (Menochius)
It seems difficult to conceive, how all the women of Palestine could present themselves before the tabernacle, 40 or 80 days after the childbirth. Perhaps the law regarded those only who lived in the neighbourhood. The priests explained to the rest what they had to do, whether they might defer bringing their offspring to the next great festival, or they might send it by another hand. We read that Anna came to the temple after she had weaned Samuel, 1 Kings i. 21. (Calmet)