NET

12 Then the Lord spoke to you from the middle of the fire; you heard speech but you could not see anything—only a voice was heard.

Darby

12 And Jehovah spoke to you from the midst of the fire: ye heard the voice of the words, but ye saw no form; only [ye heard] a voice.

KJV

12 And the LORD spake unto you out of the midst of the fire: ye heard the voice of the words, but saw no similitude; only [ye heard] a voice.

KJV Bible Notes

only ye heard a voice: Heb. save a voice.

Strong's

12 And the LORD^H3068 spake^H1696 unto you out of the midst^H8432 of the fire^H784: ye heard^H8085 the voice^H6963 of the words^H1697, but saw^H7200 no similitude^H8544; only^H2108 ye heard] heard a voice^H6963.