וּסְקַלְתּ֥וֹ בָאֲבָנִ֖ים וָמֵ֑ת כִּ֣י בִקֵּ֗שׁ לְהַדִּֽיחֲךָ֙ מֵעַל֙ יְהוָ֣ה אֱלֹהֶ֔יךָ הַמּוֹצִיאֲךָ֛ מֵאֶ֥רֶץ מִצְרַ֖יִם מִבֵּ֥ית עֲבָדִֽים׃
And thou shalt stone him with stones, that he die; because he hath sought to draw thee away from the LORD thy God, who brought thee out of the land of Egypt, out of the house of bondage.
Sifrei Devarim
(Devarim 13:11) "And you shall stone him with stones and he shall die": I might think, with many stones; it is, therefore, written (Vayikra 24:23) "and they stoned him with a stone." If "with a stone," I would think with one stone! Say, then, if he did not die with the first, he is to be put to death with a second.