Reference for Yoma 155:4

תינח מנעל סנדל מאי איכא למימר אמר רב ריחומי אנא חזיתיה לרבינא דעבר דרך מלבוש רב אשי אמר סנדל לכתחלה לא

That is all right in shoes, but what can be said in the case of sandals?<span class="x" onmousemove="('comment',' The difference between the two lies in this: that shoes, as a rule, are laced or worn tight, whence the danger of their falling off is minimized. Therefore the Rabbis above were seen wearing shoes. But sandals which are but lightly attached, might slide off.');">⁷</span> R'Rihumi said: I saw Rabina, who crossed it in sandals. R'Ashi said: One must not do so at the outset in sandals.

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