Reference for Keritot 47:9

מ"ט

What is the reason? - The Rabbis disagree with R'Meir only in the case where the offerer brought the sacrifice of his own accord, when we may assume that his conscience troubled him; but when he brought it on the strength of the evidence of two witnesses, he did not [entirely] rely on the witnesses, thinking that perhaps others might come and prove them 'plotters'.

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