Reference for Chullin 88:20

ה"מ מידי דמזבין משומא הכא מתקלא מוכח

but would not buy of its meat'! To which he replied: 'This [suspicion] applies only in the case of a firstling since it may be sold only by appraisement;<span class="x" onmousemove="('comment',' V. Bek. 31a. The meat of a firstling was not permitted to be sold by weight in the butcher's shop but only by an approximate estimation of its value.');">¹¹</span>

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