Reference for Shabbat 274:5

מאי בינייהו איכא בינייהו נראה ואינו נראה:

he must be recircumcised: otherwise he need not be recircumcised. Wherein do they differ? — They differ where it is only partially visible.<span class="x" onmousemove="('comment',' Lit., 'he appears and does not appear'. Samuel maintains that unless it is fully visible he must be circumcised, whereas the Baraitha teaches that only where it is quite invisible is recircumcision required. ');">³</span>

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