Reference for Shabbat 236:14
אמר ליה רב יוסף לרב יוסף בריה דרבה אבוך במאי זהיר טפי אמר ליה בציצית יומא חד הוה קא סליק בדרגא איפסיק ליה חוטא ולא נחית ואתא כמה דלא רמיה ואמר אביי תיתי לי דכי חזינא צורבא מרבנן דשלים מסכתיה
R. Jose also said: I have never in my life said anything from which I retracted.<span class="x" onmousemove="('comment',' Rashi refers this] to his opinions on other people: even if unfavourable he did not retract even in the owner's presence, because he did not state them in the first place without being perfectly sure of their truth. ');"><sup>37</sup></span> R. Nahman said: May I be rewarded<span class="x" onmousemove="('comment',' Lit., 'may it (sc. reward) come to me ');"><sup>38</sup></span> for observing three meals on the Sabbath. Rab Judah said: May I be rewarded for observing devotion in prayers.<span class="x" onmousemove="('comment',' I did not pray mechanically. — The same phrase is used in a derogatory and possibly opposite sense elsewhere, v. Ber. 55a, B.B. 164b. ');"><sup>39</sup></span> R. Huna son of R. Joshua said: May I be rewarded for never walking four cubits bareheaded.<span class="x" onmousemove="('comment',' Cf. infra 156b. ');"><sup>40</sup></span> R. Shesheth said: May I be rewarded for fulfilling the precept of tefillin.<span class="x" onmousemove="('comment',' V. Glos. Rashi: he never walked four cubits without wearing his tefillin; similarly with respect to fringes. ');"><sup>41</sup></span> R. Nahman also said: May I be rewarded for fulfilling the precept of fringes. R. Joseph asked R. Joseph son of Rabbah: Of what is thy father most observant? Of fringes, he replied. One day he was ascending a ladder<span class="x" onmousemove="('comment',' Or, stairs. ');"><sup>42</sup></span> when a thread [of his fringes] broke, and he would not descend until [another] was inserted. Abaye said: May I be rewarded for that when I saw that a disciple had completed his tractate,