Leviticus 12:8

And if she be not able to bring a lamb, if her poverty is such as to make it impossible for her to afford a lamb, then she shall bring two turtles (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. A significant light is thrown upon the external circumstances of Joseph's share in this world's goods by the fact that Mary was obliged to bring the sacrifice of the poor people at the time of her purification, Luke 2:24. Note also: As the little Jewish baby was received into fellowship with the covenant God by the rite of circumcision, so Christian children, cleansed from the guilt of inherited sin by the mashing of Baptism, are placed in to the arms of their Savior for their soul's salvation.