Reference for Shabbat 297:4

אלא איכא בינייהו דכתב אכותל ומיתתי למאן דאמר שמא ימחוק חיישינן למ"ד שמא יקרא לא חיישינן גודא בשטרא לא מיחלף

Surely we learnt: One may not read by the light of a lamp; whereon Rabbah said: Even if it is as high as twice a man's stature, even if it is as high as [the measurement of] two ox-goads, or even as ten houses on top of each other, he must not read?<span class="x" onmousemove="('comment',' V. supra 11a. Though he could not reach the lamp to tilt it; hence the same reasoning applies here. ');">⁴</span>

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