Reference for Shevuot 76:24
והלכתא כוותיה דרבא ולית הלכתא כוותיה דרב פפא הלכתא כוותיה דרבא דהא לא נקיט חפצא בידיה ולית הלכתא כוותיה דרב פפא דהא נקיט חפצא בידיה
and as Raba said, for Raba said: A judge who adjures by 'the Lord God of heaven' [without handing a sacred object to the person taking the oath] is counted as having erred in the ruling of a Mishnah,<span class="x" onmousemove="('comment',' Though it is not stated in the Mishnah, but is merely a law promulgated by Rab, it has the force of a mishnaic law; Sanh. 33a.');"><sup>47</sup></span> and must repeat [the ceremony correctly].<span class="x" onmousemove="('comment',' And we do not say that the judge, having already administered the oath incorrectly, should suffer the consequences of his mistake, and pay the amount denied by the debtor on this incorrectly administered oath.');"><sup>48</sup></span> And R'Papa said: A judge who adjures with tefillin<span class="x" onmousemove="('comment',' Tefillin are not deemed as sacred as a Scroll of the Law.');"><sup>49</sup></span>