Charles Ellicott Commentary Exodus 22:20

"He that sacrificeth unto any god, save unto Jehovah only, shall be utterly destroyed." — Exodus 22:20 (ASV)

He that sacrificeth. —Sacrifice in this place represents worship generally, being its most essential act. Elsewhere the death-penalty is affixed to any acknowledgment of false gods (Deuteronomy 13:1–16).

Shall be utterly destroyed. —Heb., Shall be devoted, i.e., devoted to destruction.