C. F. Keil and Franz Delitzsch on Psalms 114:1

Commotion of Nature before God the Redeemer out of Egypt

To the side of the general Hallelujah Psa 113:1-9 comes an historical one, which is likewise adorned in Psa 114:8 with the Chirek compaginis, and still further with Cholem compaginis, and is the festival Psalm of the eighth Passover day in the Jewish ritual. The deeds of God at the time of the Exodus are here brought together to form a picture in miniature which is as majestic as it is charming. There are four tetrastichs, which pass by with the swiftness of a bird as it were with four flappings of its wings. The church sings this Psalm in a tonus peregrinus distinct from the eight Psalm-tones.