The distance between heaven and Earth is unprecedented. As a result, no one can imagine a direct communication with someone in heaven while he or she is on Earth.

On three occasions in the Bible, a voice was heard from heaven — not in a vision — by three different people at different times.

Based on result, no man can hear a voice from heaven without experiencing something spectacular afterward. Of course, to every cause, there is always an effect. The effect of hearing a heavenly voice is certain.

The very first person who heard a voice from heaven was King Nebuchadnezzar.

After the dream he had, Daniel interpreted it and revealed what would happen to him: he would become more or less an animal eating grass like the Oxen for seven years.

At the time the dream was to come to pass; he heard a voice from heaven in Daniel 4:31 … “While the word was still in the king’s mouth, a voice fell from heaven: ‘King Nebuchadnezzar, to you it is spoken: the kingdom has departed from you!'"

Thereafter, he changed to another being which ate nothing but grass. Even his body structure changed to that of an animal.

The second person who heard a direct voice from heaven was... Check out the remaining part below
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At the time the dream was to come to pass; he heard a voice from heaven in Daniel 4:31 … “While the word was still in the king’s mouth, a voice fell from heaven: ‘King Nebuchadnezzar, to you it is spoken: the kingdom has departed from you!'"

Thereafter, he changed to another being which ate nothing but grass. Even his body structure changed to that of an animal.