Reference for Chullin 99:31

איזכי ואיסק ואגמרה לשמעתא מפומיה דמרה

He [Raba] said to him, 'Whence did you know to do this'? - He replied: 'Think of the number of hands that had handled [the original perforations] before they were brought to my Master'! He exclaimed: 'My son is versed in the laws concerning trefah like R'Johanan'!<span class="x" onmousemove="('comment',' V. supra 28b.');">¹⁵</span>

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