Deuteronomy 4:39

4:39 Today realize and carefully consider that the Lord is God in heaven above and on earth below – there is no other!

Deuteronomy 6:13-15

6:13 You must revere the Lord your God, serve him, and take oaths using only his name. 6:14 You must not go after other gods, those of the surrounding peoples, 6:15 for the Lord your God, who is present among you, is a jealous God and his anger will erupt against you and remove you from the land.