Johann Sebastian Bach composed the church cantata Herz und Mund und Tat und Leben, BWV 147 in 1723 during his first year as Thomaskantor, the director of church music in Leipzig. His cantata is part of his first cantata cycle there and was written for the Marian feast of the Visitation on 2 July, which commemorates Mary's visit to Elizabeth as narrated in the Gospel of Luke in the prescribed reading for the feast day. Bach based the music on his earlier cantata BWV 147a, written originally in Weimar in 1716 for Advent. He expanded the Advent cantata in six movements to ten movements in two parts in the new work. While the text of the Advent cantata was written by the Weimar court poet Salomo Franck, the librettist of the adapted version who added several recitatives is anonymous.

The cantatas composed by Johann Sebastian Bach, known as Bach cantatas, are a body of work consisting of over 200 surviving independent works, and at least several dozen that are considered lost. As far as known, Bach's earliest cantatas date from 1707, the year he moved to Mühlhausen, although he may have begun composing them at his previous post in Arnstadt. Most of Bach's church cantatas date from his first years as Thomaskantor and director of church music in Leipzig, a position which he took up in 1723.