Es erhub sich ein Streit, BWV 19, is a church cantata by Johann Sebastian Bach. He composed it in Leipzig in 1726 for the Feast of Saint Michael and first performed it on 29 September 1726. It is the second of his three extant cantatas for this feast.

Michael, also called Saint Michael the Archangel, Archangel Michael and Saint Michael the Taxiarch is an archangel in Judaism, Christianity, Islam, and the Baha'i faith. The earliest surviving mentions of his name are in third- and second-century-BC Jewish works, often but not always apocalyptic, where he is the chief of the angels and archangels, and he is the guardian prince of Israel and is responsible for the care of Israel. Christianity conserved nearly all the Jewish traditions concerning him, and he is mentioned explicitly in Revelation 12:7–12, where he does battle with Satan, and in the Epistle of Jude, where the author denounces heretics by contrasting them with Michael.