In the Old Testament, one of the most profound ways God makes His presence known is through His voice.
This is evident from the very beginning, in the Garden of Eden, after Adam and Eve have sinned and God is looking for them:
When they heard the sound of the LORD God walking about in the garden at the breezy time of the day, the man and his wife hid themselves from the LORD God among the trees of the garden (Genesis 3:8).
Reread that first line again: When they heard the sound of the LORD God walking. The word translated as sound here could more literally be rendered as voice, which only reinforces the weirdness of the sentence. Voices don’t walk. And yet, that is what the verse says. If we embrace the meaning of these words they compel a particular conclusion: that God’s voice has substance, so much so that it can ‘walk,’ noisily enough so that its very own walking is heard.