Reference for Bava Batra 290:10
רבא אמר איפכא והיינו דאמר רב משרשיא משמיה דרבא מאי דכתיב (קהלת י, ט) מסיע אבנים יעצב בהם בוקע עצים יסכן בם מסיע אבנים יעצב בהן אלו בעלי משנה בוקע עצים יסכן בם אלו בעלי גמרא
— A master of Gemara;<span class="x" onmousemove="('comment',' [Who is often in difficulty in finding his way through the maze of the involved and intricate argumentation.] ');"><sup>43</sup></span> but he that is of a merry heart hath a continual feast'' refers to<span class="x" onmousemove="('comment',' Lit., 'this', ');"><sup>44</sup></span> a master of the Mishnah<span class="x" onmousemove="('comment',' Where the teachings are given clearly and precisely. ');"><sup>45</sup></span> Raba reversed the order; and this is what R. Mesharsheya stated in the name of Raba: What [characters are referred to] in the Scriptural text, Whoso quarrieth stones shall be hurt therewith; and he that cleaveth wood is warmed up thereby?<span class="x" onmousemove="('comment',' Eccl. X, 9, Heb. [H], 'is warmed up'. (E.V. 'endangered'). ');"><sup>46</sup></span> is He that quarrieth stones shall be hurt therewith, has reference to<span class="x" onmousemove="('comment',' Lit., 'these'. ');"><sup>47</sup></span> the masters of the Mishnah;<span class="x" onmousemove="('comment',' [The study of the Mishnah alone, in the absence of the principles underlying the teaching thereof', affords no competence for the giving of decisions, V. Sotah 22a.] ');"><sup>48</sup></span>