How did God speak to Elijah at Horeb?

Answer: In a still, small voice

After the wind, earthquake and fire came a still, small voice, and a voice asked, 'What are you doing here, Elijah?'

“After the earthquake there was a fire, but the LORD was not in the fire. And after the fire came a still, small voice. When Elijah heard it, he wrapped his face in his cloak and went out and stood at the mouth of the cave. Suddenly a voice came to him and said, “What are you doing here, Elijah?””— 1 Kings 19:12-13 (BSB)