Reference for Chullin 272:7

ר' יצחק אומר משום ר' אלעאי

So in the case of the first of the fleece one should not be permitted to give one kind [as the due] for another kind! - This is indeed so, for we have learnt: IF HE HAD TWO KINDS OF WOOL, GREY AND WHITE, AND HE SOLD THE GREY BUT NOT THE WHITE.

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