High Quality Content by WIKIPEDIA articles! Darzu ist erschienen der Sohn Gottes (English: For this the Son of God appeared), BWV 40, is a church cantata by Johann Sebastian Bach. He composed the Christmas cantata in Leipzig in 1723 for the second day of Christmas and first performed it on 26 December 1723. It is the first Christmas cantata he wrote for Leipzig. The title also appears in more modern German as Dazu ist erschienen der Sohn Gottes.