Reference for Shabbat 294:16
ואין מעצבין את הקטן: אמר רבה בר בר חנה אמר ר' יוחנן לפופי ינוקא בשבת שפיר דמי והאנן תנן אין מעצבין התם בחומרי שדרה דמיחזי כבונה:
[instead of which] he read haharesh hayah libbam.<span class="x" onmousemove="('comment',' Their hearts were silent; or perhaps it is an unintelligible phrase. Each word differs only by one letter from the original to which in turn it bears some resemblance, and the story is quoted as an illustration of the seductive powers of Diomsith! ');"><sup>28</sup></span> But the scholars prayed for him, and his learning returned. And it is thus that we learnt, R. Nehorai said: Be exiled to a place of Torah, and say not that it will follow thee, for thy companions will establish it in thy possession;<span class="x" onmousemove="('comment',' Intellectual intercourse is essential if one is to retain his learning. ');"><sup>29</sup></span>