The Passover offering holds a unique tension between the intimacy of the family home and the broader call for national unity. The law strictly forbids offering this sacrifice on a private altar or in any local town [תורה תמימה, מלבי״ם].
A natural question arises as to why this specific restriction is emphasized for Passover, considering that offering any sacrifice outside the central Temple is already prohibited. The primary approach among commentators is that the distinct, home-centered nature of Passover could easily lead to a misunderstanding, making people think it is an exception to the rule.
Several factors contribute to this potential confusion. First, the original Passover in Egypt was observed without an altar or a Tabernacle; families simply prepared the offering at home, using their doorposts as altars [ספורנו, רש ר הירש]. Second, unlike most other offerings, the meat is consumed entirely by ordinary people rather than priests, and it is eaten within the privacy of their own homes [חזקוני, ביאור שטיינזלץ]. Third, because the commandment to eat matzah applies everywhere a person lives, someone might logically assume that the sacrifice accompanying the matzah could also be offered anywhere [חזקוני, בכור שור].
To counter these assumptions, the Torah stresses that even during a heavily family-focused celebration, individuals must step out of their private lives and connect to the national center and the Temple before returning to celebrate with their households. This requirement for centralization was so absolute that even during historical eras when private altars were temporarily permitted for other offerings, the Passover sacrifice could only be brought to the central public altar [רש ר הירש, מלבי״ם].
The underlying theme of singleness and unity in this command carries additional layers of practical meaning. One perspective suggests this focuses on the concept of gathering together in a single place, teaching that the offering should not be prepared for a solitary individual, but rather for a group that has assembled, though there is a dissenting view that permits an individual to do so alone [מלבי״ם]. Another approach views this focus on unity as a hint regarding time, indicating that the ban on private altars takes effect in the late afternoon of Passover eve, the exact moment when the entire public gathers as one [מלבי״ם]. Finally, a unique interpretation applies the concept of a single unit to the laws of purity. If the Israelite population is divided equally between those who are ritually pure and impure, and the impure outnumber the pure by merely a single person, that one individual does not tip the scales to define the entire community as impure. Consequently, they are not permitted to bring the offering in a state of impurity, but must instead wait to observe the Second Passover [בכור שור].