TT #67 · Parshas Shemini · Aliyah 3 · Passuk 12
Chabad.org — Vayikra Chapter 10 with Rashi
English: “Beside the altar”: this means when the altar is whole, not when it is deficient. From here the Sages derive rules about eating offerings when the altar is damaged.
Zevachim 61a.
E-Daf.com — Zevachim 61a (Tsurras Hadaf)
Textual limitation — “beside the altar” limits the permitted place of eating and establishes the rule for an altar that is intact.
The phrase “beside the altar” is understood to require an intact altar for eating the remainder of the meal offering, and the same principle is extended to other most-holy offerings.