Leviticus 4

Leviticus 4:2

Richard Challoner: Ignorance: To be ignorant of what we are bound to know is sinful; and for such culpable ignorance, these sacrifices, prescribed in this and the following chapter, were appointed.

Leviticus 4:3

John Chrysostom: And before the time of the prophets, when he wanted to show that sins received a much heavier penalty when they were committed by the priests than when they were committed by ordinary people, he commanded as great a sacrifice to be offered for the priests as for all the people. This explicitly proves that the priest’s wounds require greater help, indeed as much as those of all the people together. They would not have required greater help if they had not been more serious, and their seriousness is not increased by their own nature but by the extra weight of dignity belonging to the priest who dares to commit them. — On the Priesthood 6.16

Leviticus 4:5

Cyril of Jerusalem: He is called by two names, Jesus Christ; Jesus because he is a savior, Christ because he is a priest. With this in mind the divinely inspired prophet Moses gave these two titles to two men eminent above all, changing the name of his own successor in the sovereignty, Auses, to Jesus, and giving his own brother, Aaron, the surname Christ, that through these two chosen men he might represent at once the high priesthood and the kingship of the one Jesus Christ who was to come. — Catechetical Lecture 10.11

Richard Challoner: The blood: As the figure of the blood of Christ shed for the remission of our sins, and carried by him into the sanctuary of heaven.