a sound of sheer silence

He said, "Go out and stand on the mountain before the LORD, for the LORD is about to pass by." Now there was a great wind, so strong that it was splitting mountains and breaking rocks in pieces before the LORD, but the LORD was not in the wind; and after the wind an earthquake, but the LORD was not in the earthquake; and after the earthquake a fire, but the LORD was not in the fire; and after the fire a sound of sheer silence. When Elijah heard it, he wrapped his face in his mantle and went out and stood at the entrance of the cave. Then there came a voice to him that said, "What are you doing here, Elijah?" He answered, "I have been very zealous for the LORD, the God of hosts; for the Israelites have forsaken your covenant, thrown down your altars, and killed your prophets with the sword. I alone am left, and they are seeking my life, to take it away."
1 Kings 19:11-14