Kantate, BWV 60 "O Ewigkeit, du Donnerwort"

O Ewigkeit, du Donnerwort (O eternity, you word of thunder), BWV 60, is a church cantata for the 24th Sunday after Trinity composed by Johann Sebastian Bach. It was first performed in Leipzig on 7 November 1723, and is part of Bach's first cantata cycle. It is one of Bach's dialogue cantatas: its topic, fear of death and hope of salvation, plays out mainly through a conversation between two allegorical figures, Fear (sung by an alto voice) and Hope (sung by a tenor).

There are five movements. The orchestral accompaniment is assigned to a Baroque instrumental ensemble of horn, two oboes d'amore, strings and continuo. The first four movements are duets. The opening movement is a chorale fantasia containing a stanza from Johann Rist's "O Ewigkeit, du Donnerwort" and a biblical quotation from the Book of Genesis. The second and third movements are respectively a recitative and an aria.