Reference for Bekhorot 8:9

אלא אמר קרא

Just as with the money prescribed for all time, they both redeemed [the first-born] at all times and they redeemed at that particular time [in the wilderness], so with sheep prescribed for all time, they [the Levites] both redeemed [the firstlings] at all times and they redeemed at that particular time [in the wilderness].

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