Deuteronomy 4:35-39

To you it was shown, that you might know that the LORD Himself is God; there is none other besides Him. Out of heaven He let you hear His voice, that He might instruct you; on earth He showed you His great fire, and you heard His words out of the midst of the fire. And because He loved your fathers, therefore He chose their descendants after them; and He brought you out of Egypt with His Presence, with His mighty power, driving out from before you nations greater and mightier than you, to bring you in, to give you their land as an inheritance, as it is this day. Therefore know this day, and consider it in your heart, that the LORD Himself is God in heaven above and on the earth beneath; there is no other.