Parashas Tetzaveh · Passuk 29:12
Chabad.org — English translation + Rashi
Torah Temimah points to Zevachim 62a (verified).
Sefaria — Exodus 29:12
Sefaria — Zevachim 62a
E-Daf — Zevachim 62a
English: A baraita teaches that the altar’s foundation is indispensable. Rav Huna derives this from the wording “the foundation of the altar”: where Scripture uses “the altar” in this context, the prescribed altar structure is indispensable.
On the daf / in context: See the cited source for the full section.
Derash on the verse.
A valid altar requires its foundation; the Torah’s wording makes the foundation part of the altar’s indispensable structure.