Confiteor

The Confiteor (so named from its first word in Latin) is one of the prayers that can be said during the Penitential Rite at the beginning of Mass of the Roman Rite in the Catholic Church. It is also said in the Lutheran Church at the beginning of their Divine Service. It is started by the Priest and ended by the people.

Read more about Confiteor:  History, Usage in Lutheranism, In Popular Culture