דברים, פרק י״ז, פסוק י״א

The preservation of Jewish law across generations relies fundamentally on the authority of spiritual leadership and the Great Court. God grants absolute validity to the interpretations and decrees of the sages, establishing a centralized authority to prevent a multitude of conflicting opinions from fracturing the nation. The scope of this authority encompasses three distinct layers of the Oral Tradition [העמק דבר, אלשיך, רש ר הירש, אדרת אליהו]. The first layer includes teachings derived directly from the plain meaning of the text, as well as decrees and customs established by the sages to strengthen religious life and improve society. This requires absolute faith in the court's moral instruction, without demanding that they prove their authority through miracles [בכור שור, תורה תמימה]. The second layer consists of laws derived through traditional methods of interpretation, alongside judicial decisions based on a judge's discretion regarding time, place, and the occasional need to compromise absolute truth for the sake of peace [כלי יקר]. The third layer comprises traditions passed down orally from Moses at Sinai, which may lack an obvious rationale or direct textual proof.

The strict command to follow the rulings of the sages forms the foundation for all rabbinic law [תורה תמימה]. Because God explicitly commanded obedience to the court, one can recite a blessing over rabbinic commandments, such as lighting the Hanukkah lamp, acknowledging that the act fulfills God's overarching will [גור אריה, רש ר הירש]. While this mandate is incredibly strict, it differs from biblical prohibitions in that it can occasionally be set aside to preserve human dignity [תורה תמימה]. Furthermore, this warning applies not only to the general public but to the sages themselves, cautioning them not to issue rulings that contradict the decisions of the Great Court [רלב״ג].

The injunction against turning to the right or the left means one must not stray from the sages' instruction in any direction [בכור שור], neither toward excessive strictness nor undue leniency [אם למקרא]. However, a deeper implication emerges regarding the nature of their rulings. One must not deviate from what the court defines as right or left, even if reality appears to be the exact opposite [כלי יקר, אלשיך, שפתי כהן, משכיל לדוד]. This leads to the famous Talmudic principle that even if the sages show you that right is left and left is right, you must listen to them [רש״י].

The primary approach among commentators is that even if a person is entirely convinced in their heart that the court is mistaken—as clearly as they can distinguish their own right hand from their left—they must nullify their personal opinion and obey [רמב״ן, הטור הארוך, מזרחי, ביאור יש״ר]. The reasoning is both practical and spiritual. Human nature inevitably breeds disagreement; if every individual acted according to their own logic, the Torah would splinter into countless different versions. Therefore, God gave the written law on the condition that it be subject to the unified agreement and interpretation of the Great Court. Moreover, God's spirit rests upon those serving in the Temple, protecting them from error, so an individual should assume the flaw lies in their own understanding rather than in the court's ruling [שפתי חכמים, מלבי״ם].

An even deeper perspective suggests that a legal ruling actually alters reality itself. The moment the court issues a decision, that ruling becomes the absolute truth and the will of God. Consequently, even if the sages appear to have made a factual error, obeying them is the very fulfillment of God's command [גור אריה, חומש קה״ת]. Because the sages carefully weigh all aspects of a doubt and combine all supporting arguments, their conclusions always rest on a solid legal foundation [כלי יקר].

In contrast, a tradition in the Jerusalem Talmud seems to present the opposite directive, stating that if the sages tell you right is left, you should not listen to them. Commentators harmonize this apparent contradiction in several ways. Some explain that the absolute duty to obey, even in error, applies only to rabbinic decrees, but not when a sage mistakenly permits a clear and explicit biblical prohibition [ריב״א]. Others draw a distinction based on certainty: if a dispute is complex and it merely appears to an individual that the court is wrong, they must nullify their opinion. However, if it is absolutely and demonstrably proven that the court has completely erred in its judgment, one must not obey [הכתב והקבלה, תורה תמימה, ברכת אשר]. A final approach distinguishes between passive and active responses. If a person can avoid violating the prohibition passively—simply by refraining from an action the court mistakenly permitted—they should do so to avoid sinning without openly rebelling. But if the situation demands active participation and evasion is impossible, they must comply with the court to avoid the appearance of undermining its vital authority [דברי דוד].