John 1:23

1:23 John said, “I am the voice of one shouting in the wilderness, ‘Make straight the way for the Lord,’ as Isaiah the prophet said.”

John 5:28

5:28 “Do not be amazed at this, because a time is coming when all who are in the tombs will hear his voice

John 5:37

5:37 And the Father who sent me has himself testified about me. You people have never heard his voice nor seen his form at any time,

John 10:3-5

10:3 The doorkeeper opens the door for him, and the sheep hear his voice. He calls his own sheep by name and leads them out. 10:4 When he has brought all his own sheep out, he goes ahead of them, and the sheep follow him because they recognize his voice. 10:5 They will never follow a stranger, but will run away from him, because they do not recognize the stranger’s voice.”

John 12:29

12:29 The crowd that stood there and heard the voice said that it had thundered. Others said that an angel had spoken to him.