Wed Nazir 25

The rule is from a Halacha L' Moshe Misinai : all cases where a Chatas dies, an Ashum must go to pasture. The Pasuk of "Ashum should be" that only as is it's an Ashum. But once you bring it to pasture it's no longer an Ashum, and if B'Dieved you Shect it for an Olah it's kosher.

Tosfos brings the gemara in pesachim that going to pasture is only a rabbinic decree. Really you should make it an Oleh . However you might do so before a different Ashum was brought and is still meant to be an Ashum, so they enacted that he must bring it to graze first. However, the pasuk is to tell us that there needs to be a Hefsik and redesignation for an Olah so that it's a Kosher Olah.

And to those that hold you don't need to redesignate it, they must learn the Pasuk "the Ashum shall be" that it's only an Asum when it's still meant to be an Asum. However, after it's no longer meant to be an AShum, then it's really now an Olah with redesignating.

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