This chorale prelude is a relatively simple bicinium. The left hand provides a lively accompaniment to the chorale melody in the right hand. What makes this piece more interesting, is not the music itself, but the curious fact that Johann Christoph Kühnau added a part for the right hand between the stanza’s of the chorale melody and published it as his own work.
The source for this chorale prelude is an edition from 1900 by Alexandre Guilmant. See the score for the link.