Deuteronomy 4:35-36
Deuteronomy 4:35-36 AMP
It was shown to you so that you might have [personal] knowledge and comprehend that the LORD is God; there is no other besides Him. Out of the heavens He let you hear His voice to discipline and admonish you; and on earth He let you see His great fire, and you heard His words from the midst of the fire.