Reference for Chullin 108:21

עילא מינאי הוה קאי בר נפחא ובעא מיני דינרא קורדינאה לשערי ביה טריפתא ובעי למיקם מקמיה ולא שבקני אמר לי

R'Nahman said: An exact sela' is regarded as more than a sela'; likewise an exact issar is regarded as more than an issar.<span class="x" onmousemove="('comment',' Wherever the Rabbis fixed the standard of measure, either a sela', as in the case of a deficiency in the skull or a deficiency in the rumen, or an issar, as in our Mishnah, they intended to convey that where the measure was exactly the size of the standard fixed it was always to be regarded as more than the standard, with all the results consequent thereto.');">⁷</span>

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