Reference for Shabbat 297:5

ולמ"ד שמא יקרא ליחוש שמא ימחוק אלא איכא בינייהו דחייק אטבלא ואפינקס למ"ד שמא ימחוק לא חיישינן למ"ד שמא יקרא חיישינן

— Rather they differ where it is written on the wall and is low down: according to him who says, 'Lest he erase', we fear; [but] according to him who says, 'Lest he read [secular documents]', we do not fear, [for] one will not confuse a wall with a document.<span class="x" onmousemove="('comment',' No one is likely to think that since he may read something written on a wall he may also read business documents. ');">⁵</span>

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