Acts 9:7
"And the men which journeyed with him stood speechless, hearing a voice, but seeing no man."
Cross References (ranked by relevance)
Acts 22:9
14
And they that were with me saw indeed the light, and were afraid; but they heard not the voice of him that spake to me.
Daniel 10:7
And I Daniel alone saw the vision: for the men that were with me saw not the vision; but a great quaking fell upon them, so that they fled to hide themselves.
John 12:29
The people therefore, that stood by, and heard it, said that it thundered: others said, An angel spake to him.