Reference for Bekhorot 74:15

זה בעלי מומין שנפדו

I might, however, conclude that one may redeem in consequence of a transitory blemish, hence Scripture explicitly states: 'Of which they may not bring an offering unto the Lord', thus intimating [that it refers to] a sacrifice which is completely unfit [for the altar], but excluding this case of a transitory blemish, which although unfit for sacrifice today, is fit tomorrow.

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