Deuteronomy 4:35-39

To you it was shown, that you might know that the LORD is God; there is no other besides him. Out of heaven he let you hear his voice, that he might discipline you. And on earth he let you see his great fire, and you heard his words out of the midst of the fire. And because he loved your fathers and chose their offspring after them and brought you out of Egypt with his own presence, by his great power, driving out before you nations greater and mightier than you, to bring you in, to give you their land for an inheritance, as it is this day, know therefore today, and lay it to your heart, that the LORD is God in heaven above and on the earth beneath; there is no other.