Reference for Bekhorot 61:47

ושוקלין מנה כנגד מנה בבכור:

THE PROFIT ON DEDICATED OBJECTS WHICH BECAME UNFIT [FOR THE PURPOSE CONSECRATED] GOES TO THE SANCTUARY. YOU MUST WEIGH ONE PIECE OF MEAT OF THE FIRST-BORN AGAINST ANOTHER PIECE OF ORDINARY MEAT OF ASCERTAINED WEIGHT.

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