Or HaChaim on Deuteronomy
וסקלתו באבנים, "you shall pelt him with stones, etc. Zohar volume three page 272 speaks of 5 stones needed to kill Satan the enticer and describes the number as a mystical dimension of the verse שמע ישראל.
Sforno on Deuteronomy
כי בקש להדיחך, even though he did not cause tangible damage, and therefore might have thought himself immune from prosecution, as opposed to the person who incited to idolatry in the Ir Hanidachat, a city whose majority became idolaters. He is guilty of the death penalty כי בקש להדיחך, because of his attempt to convert people to idolatry. His execution will prevent him from seducing still others. Failure to execute him might result in his success.
Rav Hirsch on Torah
V. 11. המוציאך וגו׳: alles, was du zu wissen brauchst, um Gott als Gott und als deinen Gott für immer unwandelbar anzuerkennen, ist dir durch יציאת מצרים gegeben.