The Basics of Judaism: G-d & Torah: Adding to the Torah:
How do we know that nothing will be added to the Torah?
It's explicit in the Torah that WE can't add to or
subtract from it (Deut.4:2, 13:1). The idea that G-d
won't add to the Torah is deducible from the Torah,
but isn't explicit. The Talmud derives from "These
are the commandments" (e.g., Lev.27:34) the fact
that no prophet can add to the Torah; see Shab.104a.
The Talmud also derives from "It is not in heaven"
(Deut.30:12) the fact the Torah is now in human
hands, which implies that it won't be added to.
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