The LORD thundered from heaven, and the most High uttered his voice.
The Lord thundered from heaven, and the Most High uttered his voice - namely, against my enemies (see the notes at last clause of 2 Samuel 22:8). The second clause is a mere echo of the first, because "the voice" of God frequently denotes thunder, (Exodus 9:28; Job 37:5; Psalms 29:1.)