Du wahrer Gott und Davids Sohn, BWV 23, is a church cantata by Johann Sebastian Bach. He composed it in Köthen between 1717 and 1723 for Quinquagesima Sunday and performed it as an audition piece for the position of Thomaskantor in Leipzig on 7 February 1723. The Sunday was the last occasion for music at church before the quiet time of Lent.
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