Moses spoke the words of Deuteronomy at the end of the Israelites’ 40 years in the dessert. The overarching theme of the book was that as the Israelites were preparing to enter the Promised Land, they were to remember who God is, what He had done for them, and how they were to live as His covenant people.
Deuteronomy 4:32-39 (CSB): “Indeed, ask about the earlier days that preceded you, from the day God created mankind on the earth and from one end of the heavens to the other: Has anything like this great event ever happened, or has anything like it been heard of? Has a people heard God’s voice speaking from the fire as you have, and lived? Or has a god attempted to go and take a nation as his own out of another nation, by trials, signs, wonders, and war, by a strong hand and an outstretched arm, by great terrors, as the LORD your God did for you in Egypt before your eyes? You were shown these things so that you would know that the LORD is God; there is no other besides him. He let you hear his voice from heaven to instruct you. He showed you his great fire on earth, and you heard his words from the fire. Because he loved your ancestors, he chose their descendants after them and brought you out of Egypt by his presence and great power, to drive out before you nations greater and stronger than you and to bring you in and give you their land as an inheritance, as is now taking place. Today, recognize and keep in mind that the LORD is God in heaven above and on earth below; there is no other.”