Deuteronomy 4:15
So since you saw no form of any kind on the day the LORD spoke to you out of the fire at Horeb, be careful
Berean Standard Bible
Take ye therefore good heed unto yourselves; for ye saw no manner of similitude on the day that the LORD spake unto you in Horeb out of the midst of the fire:
Be very careful, for you saw no kind of form on the day that the LORD spoke to you in Horeb out of the middle of the fire,