''', is a church cantata by Johann Sebastian Bach. He composed it in Leipzig for the Feast of St. John the Baptist and led the first performance on 24 June 1724. It is the third chorale cantata from his second annual cycle of chorale cantatas, based on Martin Luther's "", a hymn about baptism. Luther's first and last stanza are used unchanged (the former treated as a chorale fantasia, the latter as a four-part closing chorale) and an unknown librettist paraphrased the five inner stanzas into a corresponding number of recitatives and arias. The cantata is scored for three vocal soloists (alto, tenor and bass), a four-part choir, two oboes d'amore, two solo violins, strings and basso continuo.