Psalm 124 is the 124th psalm of the Book of Psalms, beginning in the English of the King James Version: "If it had not been the LORD who was on our side, now may Israel say". The Book of Psalms is part of the third section of the Hebrew Bible, and a book of the Christian Old Testament. In Latin it is known as "Nisi quia Dominus". It is one of fifteen psalms that begin with the words "A song of ascents". Using "conventional metaphors", it recalls the dangers faced by Israel from which the nation has been rescued.

Justus Jonas, the Elder, or simply Justus Jonas, was a German Lutheran theologian and reformer. He was a Jurist, Professor and Hymn writer. He is best known for his translations of the writings of Martin Luther and Philipp Melanchthon. He accompanied Martin Luther in his final moments.