Deuteronomy 6:13–15: Worship Only Yahweh
Deuteronomy 6:13–15 sets Israel's loyalty on Yahweh alone and treats any rival worship as covenant betrayal that provokes real anger. Satan worship falls under that same prohibition, because it gives a created being what belongs only to the God who rescued his people.
Exodus 20:3–6: Is Having Idols a Sin?
Exodus 20:3–6 forbids both the inner allegiance of having another god and the outward acts of making, bowing to, and serving images. The command rests on God's identity and his rescue of Israel, not on a bare rule.
Exodus 20:3–6: What Idolatry Really Means
The second commandment forbids both rival gods and manufactured images, and it locates the real issue in the heart's allegiance. Idolatry is giving to something created the trust and devotion that belong to God alone.