Reference for Shevuot 92:10
וליתני נמי שבועת בטוי כי קתני שבועה דכי קא משתבע בשקרא קא משתבע אבל שבועת בטוי דאיכא למימר דבקושטא קא משתבע לא קתני
Let him<span class="x" onmousemove="('comment',' The Tanna of our MISHNAH:');"><sup>26</sup></span> mention also the oath of utterance. - He mentions only such an oath that at the time of swearing he swears falsely; but the oath of utterance, where it is possible to say that he is swearing the truth,<span class="x" onmousemove="('comment',' E.g., he swears 'I shall not eat this loaf'; at the moment of swearing he may intend to fulfil it; even if later he is overcome by temptation, and eats it, he should not thereby be accounted untrustworthy and debarred from taking an oath in a money claim.');"><sup>30</sup></span> he does not mention.