Ich lasse dich nicht, BWV Anh.159

The piece, as it is known since the rediscovery of the collection Altbachisches Archiv in 1999, contains two movements, one for double chorus based on a text from the book Genesis in which the patriarch Jacob asks God for a blessing, followed by a closing chorale. The first movement is known as a score without author, partly in J. S. Bach's handwriting. It was attributed by Bach authorities to Johann Christoph Bach since the 19th century, while others including Philipp Spitta doubted that attribution. The chorale is one of J. S. Bach's chorale settings and was possibly added in 1802 when the motet was first printed.