דברים, פרק י״ב, פסוק י״ג

As the Israelites transitioned from a period where sacrifices were permitted anywhere to an era requiring a fixed, central Temple, a firm boundary was established against offering sacrifices outside this designated space [ביאור שטיינזלץ]. Although a positive command already exists to bring all offerings to the Temple, an explicit negative command is added to heighten the severity of the restriction. This addition functions as a necessary preliminary warning of the severe spiritual punishment of excision that applies to anyone who violates this rule by sacrificing on a private altar [רש״י, מזרחי, גור אריה, שפתי חכמים, רש ר הירש, אדרת אליהו, בכור שור].

The prohibition specifically highlights burnt offerings, prompting a discussion on why this particular sacrifice is singled out. One perspective suggests that because a burnt offering is entirely consumed by fire for God, with no portion eaten by the priests, an individual might mistakenly believe it is permissible to offer it on a private altar simply to please God [ביאור יש״ר, אברבנאל]. Another approach notes that the primary goal of a burnt offering is to achieve spiritual closeness and knowledge of God. Consequently, a person might incorrectly assume that such an offering is appropriate in any space dedicated to prayer, such as a synagogue [העמק דבר]. Alternatively, other commentators maintain that the burnt offering simply serves as a brief, inclusive term representing all types of sacrifices [רלב״ג, תורה תמימה].

The warning against offering sacrifices in any chosen location carries multiple layers of meaning. Some understand this as referring to physical preference—any site that simply looks attractive and fitting for an altar [שד״ל, פענח רזא, בכור שור]. However, the primary approach among commentators is that it refers to mental sight, meaning any location that merely appeals to the mind and heart [רש״י, מזרחי, גור אריה]. This restriction also serves to clearly separate holy sacrifices from regular meat meant for everyday consumption, which is permitted anywhere without the strict limitations of ritual purity [אבן עזרא, אברבנאל]. Historically, this concept also echoes the era of the Tabernacle in Shiloh, where certain minor holy sacrifices could be eaten anywhere within a direct physical line of sight to the sanctuary [תורה תמימה]. Ultimately, the strict ban on private altars stems from a deep historical concern: if the people were allowed to sacrifice locally, they would cease making pilgrimages to the central Temple, a fracture in national worship that could inevitably lead to idolatry [חזקוני].

Despite this sweeping prohibition, there remains one significant exception. Sacrifices may be offered outside the central Temple as a temporary measure directed by a true prophet, provided there is absolutely no element of idolatry involved. The clearest example of this is Elijah the prophet, who built an altar on Mount Carmel to publicly disprove the prophets of Baal, alongside similar actions taken by Gideon and Manoah [רש״י, רבנו בחיי, משכיל לדוד, אדרת אליהו, ברכת אשר]. This exception is subtly hinted at in the instruction not to sacrifice anywhere one sees fit. In the Bible, a prophet is often referred to as a seer. Therefore, while an individual is forbidden from offering a sacrifice wherever they personally desire, they are permitted to do so in a location specifically instructed by the seer [תורה תמימה].