Erhalt uns Herr, bei Deinem Wort

"Erhalt uns, Herr, bei deinem Wort" ("Keep us, Lord, faithful to your word" or "Lord, keep us in Thy Word and Work" is a Lutheran hymn by Martin Luther with additional stanzas by Justus Jonas, first published in 1542.
It was used in several musical settings.

Luther wrote the hymn probably in 1541 when a prayer service was held in Wittenberg against the perceived danger of the Turks when Ferdinand of Austria lost most of Hungary to the Ottoman Empire at Siege of Buda.
The second line of the first verse reads "und steur' des Papsts und Türken Mord" (And control the murder by the Pope and Turks). Luther may have contributed the hymn for a boys' choir. It was published as a broadsheet in 1542.

Chorale preludes on the melody were written by Dietrich Buxtehude, Johann Pachelbel, Georg Böhm, and Hugo Distler, among others.

This chorale prelude is attributed to Boehm, Buxtehude, Pachelbel or Bach in various editions.
It is still not certain who wrote it.
My bet is on Boehm or Buxtehude.

The melody of this work is in the pedal part.
In the recording it is played twice with different registrations on the beautiful Trost organ of Walthershausen.

The first is a soft registration with a small reed stop in the pedal and the second on a full 16' plenum on HW and pedal; the last sentence of the text with the pedal 32' added.

The second recording starts at approx 3' 45''