Reference for Shabbat 120:7

בשלמא לרבי חנינא הוא דאמר כרבי נתן אלא רבי יוחנן דאמר כמאן הוא דאמר כר' נהוראי דתניא ר' נהוראי אומר ה' מותר ושבע אסור

Rab Judah said in Samuel's name: They learnt this only [where the nails are] to strengthen [the sandal], but where they are ornamental, it is permitted.<span class="x" onmousemove="('comment',' To go out wearing the sandal on the Sabbath. Nails are normally put in to strengthen the sandal, and such must have been worn on the occasion of the tragedy; hence the decree was only in respect of same. ');">⁷</span>

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