Deuteronomy 6:13-15

You shall fear [only] the LORD your God; and you shall serve Him [with awe-filled reverence and profound respect] and swear [oaths] by His name [alone]. You shall not follow other gods, any of the gods of the peoples who surround you, for the LORD your God who is among you is a jealous (impassioned) God [demanding what is rightfully and uniquely His]—otherwise the anger of the LORD your God will be kindled and burn against you, and He will destroy you from the face of the earth.