The Catechism of the Catholic Church: «Justification has been merited for us by the Passion of Christ who offered himself on the cross as a living victim, holy and pleasing to God, and whose blood has become the instrument of atonement for the sins of all men.... (firstthings.com)
[20] The most solemn sin offering occurred once a year as the High Priest sprinkled blood in the Holy of Holies in atonement for the sins of the nation. (faith.org.uk)