Bekhorot 14B

נפדין תמימים או אין נפדין תמימין?

The halakha is that the offspring of an animal that possesses inherent sanctity is born sanctified, and therefore it cannot be redeemed until it develops a blemish. The Talmud asks: With regard to the offspring of an animal that possesses sanctity that inheres in its value, are they redeemed unblemished, or are they not redeemed unblemished? In other words, can they be redeemed immediately, or must one wait until they develop a blemish?

תא שמע: המתפיס בעלי מומין קבועין לגבי מזבח, וילדו ⁠— ימכרו, ואין צריכין מום, שאין קדושה חלה עליהן, שלא יהא טפל חמור מן העיקר.

The Talmud suggests: Come and hear a proof from a baraita: With regard to one who dedicates permanently blemished animals for the altar, and those animals gave birth, their offspring may be sold in order to be redeemed and they do not require a blemish to render their sale permitted. The reason is that they are not imbued with sanctity, and that the subsidiary sanctity of the offspring should not be more stringent than the primary sanctity of the mother. Since the blemished mother can be redeemed without delay, the same applies to its offspring. This proves that the offspring of animals that possess sanctity that inheres in their value may be redeemed.

טעמא, שלא יהא טפל חמור מן העיקר, אבל הקדיש זכר לדמיו ⁠— קדוש קדושת הגוף. מסייע ליה לרבא, דאמר רבא: הקדיש זכר לדמיו ⁠— קדוש קדושת הגוף.

The Talmud notes: The reason that the baraita rules that the sanctity for the altar does not take effect is that the subsidiary sanctity should not be more stringent than the primary sanctity, i.e., the only reason it is not sanctified for the altar is because its sanctity is derived from its mother, which cannot be sanctified for the altar as it is blemished. But if one consecrated an unblemished male animal for its value, where there is no secondary consecration, it is sanctified with inherent sanctity. The Talmud adds that this supports the opinion of Rava, as Rava says: If one consecrated a male animal for its value, it is sanctified with inherent sanctity.