Bach wrote his motets in the tradition of the
Evangelienmotetten (motets on gospel texts) of the 17th century by composers such as
Melchior Franck,
Melchior Vulpius and
Heinrich Schütz. When he composed these works, music without an independent orchestra on texts limited to biblical words and a chorale without contemporary poetry, the genre was already out of fashion, but there was evidently a demand for such works at funerals, a ceremony for which at least some of Bach's motets were written.
Ich lasse dich nicht, then known as only the first movement, was attributed in the 19th century to both Johann Sebastian Bach and
Johann Christoph Bach, his
father's cousin. In the Bach-Ausgabe, the editor
Franz Wüllner described the piece as "one of the most beautiful works of German church music" but not "authentic", therefore giving Johann Christoph Bach as the composer. When
Wolfgang Schmieder created the
Bach-Werke-Verzeichnis in 1950, he followed Wüllner, placing the motet in the appendix and assigning "presumably by Johann Christoph Bach". When
Konrad Ameln edited Bach's motets for the
Neue Bach-Ausgabe, he consequently omitted it, but it was printed in the appendix. Other authorities had doubted this attribution, for example
Philipp Spitta, who in the first edition of
his Bach biography mentioned Johann Christoph Bach as the composer, but in the second added that "the source evidence didn't permit a definite attribution".
Ich lasse dich nicht in two movements was found, written partly in Bach's hand, in the
Altbachisches Archiv, a collection of music of the Bach family which the Bach scholar
Christoph Wolff rediscovered in
Kyiv in 1999. Bach scholars now assume that J. S. Bach composed the first movement, possibly during his
Weimar period around 1712. The chorale is a transcription of one of his organ pieces and was possibly added in the 19th century.
John Eliot Gardiner, who recorded Bach motets including this one in 2011, comments on the authorship: The closing chorale was not part of the score but appeared first in the first print of the motet in 1802 by
Johann Gottfried Schicht, also a
Thomaskantor. He found the setting in Bach's chorales collected by
Carl Philipp Emanuel Bach and
Johann Philipp Kirnberger in 1787, transposed it from A minor to F minor and adjusted the time to the motet. == Text, scoring and structure ==