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The existence of a third Passion by Bach based on the Gospel of St. Mark had long been known. Numerous studies carried out from the second half of the 20th century by specialist musicologists and musicians confirmed that on Good Friday, 1731, Bach presented this Passion set to a text by Picander, which the latter published one year later at the same time as his third volume of poetry. In 2009, the existence of this Passion was fully confirmed by the discovery at St. Petersburg of a later version of the libretto used for a new performance of the work, which took place in 1744. Compared with the 1732 libretto, it contains a number of modifications to the texts, as well as a different ordering of some chorales and arias and the addition of two new arias. Thanks to the new version, we have a very clear idea of the form and content of this third Passion by Bach.