Do Not Add to What the Torah Commands
Bal Tosif — The Complete Torah and the Prohibition on Supplementation
Deut 4:2: “You shall not add to the word which I command you, neither shall you take away from it, that you may keep the commandments of Yahweh your God which I command you.” The prohibition is symmetrical: neither add nor subtract. Both acts treat the Torah as a document that human authority can modify. The Torah presents itself as the complete and final record of the covenant legislation. Adding to it claims that God’s legislation was incomplete and requires human supplementation. Removing from it claims that God’s legislation was excessive and requires human correction. Both are forms of treating human judgment as superior to divine legislation.
The prohibition appears twice in the Torah: Deut 4:2 and Deut 13:1: “Everything that I command you, you shall be careful to do. You shall not add to it or take from it.” The repetition at the beginning of Deuteronomy 4 (entering the land) and at the beginning of Deuteronomy 13 (in the context of false prophets) is deliberate: the prohibition on adding is specifically connected to the false-prophecy context. A false prophet who claims a new permanent commandment from God is violating bal tosif: they are adding to the Torah’s 613 commandments by attributing to God a legislation he did not give.
Rabbinic Enactments and the Torah — A Careful Distinction
The rabbinic tradition responded to the prohibition on adding to the Torah with a carefully maintained distinction between Torah-level obligations (d’oraita) and rabbinic enactments (d’rabbanan). When the rabbis extended Shabbat prohibitions (adding a preparatory period before sundown), they did not claim this extension was Torah-commanded. When they added lighting Chanukah candles or reading the Megillah, they attributed these to rabbinic authority, not to the 613 commandments. The prohibition on bal tosif is what forces this careful attribution: claiming rabbinic legislation is Torah-legislation would be adding to the Torah.
The Talmud (Rosh Hashanah 16a, Sanhedrin 88b) addresses specific cases of how the prohibition works. Adding a fifth species to the Sukkot four-species bundle is not adding a commandment — it’s performing the commandment incorrectly. But claiming that a fifth species is Torah-required (that God commanded five) would be adding to the Torah. The distinction is between action (you can wave a fifth species; it just doesn’t fulfill anything) and attribution (you cannot claim God commanded five). The prohibition targets the claim of divine authorization, not the action itself.
Isaiah's Torah From Zion — The Completed Legislation
Isa 2:3: “For out of Zion shall go forth the Torah, and the word of Yahweh from Jerusalem.” Isaiah’s vision of the nations streaming to Zion to learn Torah has a specific form: the Torah goes OUT from Zion, not new legislation from Zion. The covenant document is completed; its teaching spreads, but its content is fixed. The prohibition on adding to the Torah is what gives Isaiah’s vision its structure: if the Torah were supplementable by human authority, “the Torah going forth from Zion” would be an endlessly shifting document. Its going forth means something because its content is settled.
Deuteronomy closes with Deut 34:10: “There has not arisen a prophet since in Israel like Moses, whom Yahweh knew face to face.” The unique character of Mosaic prophecy — the only prophecy that could establish permanent commandments — is what makes the 613 commandments final. No subsequent prophet, however authoritative, can add permanent commandments to the Torah. The ban on heeding false prophets (#431) and the prohibition on adding to the Torah (#433) together close the space through which new permanent obligations could be introduced under divine authority. The Torah given through Moses is complete.
- The Double Appearance — Deut 4:2 and Deut 13:1: the prohibition on adding appears twice — at the entry to the land and in the false-prophecy section. The second appearance places bal tosif in the false-prophet context specifically: a prophet who adds a permanent commandment claims what God did not give.
- The d’oraita / d’rabbanan Distinction: the rabbinic tradition’s response to the prohibition — all rabbinic enactments are explicitly marked as rabbinic, not Torah-level. The prohibition forces this attribution. The community must always know what God commanded and what human authority enacted.
- Isaiah’s Torah From Zion — Isa 2:3: “out of Zion shall go forth the Torah.” The Torah goes forth; new legislation does not arise. The prohibition on adding to the Torah is what makes this image coherent — a completed document whose content is settled and whose teaching spreads.
Read the source passage in the Torah reader.
Read in the Torah Reader — Deuteronomy 4:2