Credo

Credo III in The Liber Usualis
An example: the autograph first page of the Symbolum Nicenum (the Credo) from Johann Sebastian Bach's Mass in B minor

In Christian liturgy, the credo (Latin: [ˈkɾeːdoː]; Latin for "I believe") is the portion of the Mass where a creed is recited or sung. The Nicene-Constantinopolitan Creed or the Apostles' Creed are the primary creeds used for this purpose.