Deuteronomy 4:34-36

4:34 Or has God ever before tried to deliver a nation from the middle of another nation, accompanied by judgments, signs, wonders, war, strength, power, and other very terrifying things like the Lord your God did for you in Egypt before your very eyes? 4:35 You have been taught that the Lord alone is God – there is no other besides him. 4:36 From heaven he spoke to you in order to teach you, and on earth he showed you his great fire from which you also heard his words.