For the source text click/tap here: Zevachim 59
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Rav says that if the altar was cracked, all sacrifices slaughtered are invalid. Rav says that there was a verse to prove this, but we forgot it. When Rav Kahana went up to Eretz Yisroel, he found Rabbi Shimon b’Rebbi, who quoted Rabbi Yishmael beRabbi Yossi who said that this is learned from the verse which states that you should slaughter on it (i.e., the altar) es olosecha v'es shlamecha – your ola and shlamim sacrifices.
The verse cannot be literal, since the sacrifices are not slaughtered on the altar.
We explore the broken altar as a typology as well as the Rambam's view of sacrifices.