Reference for Kiddushin 99:5
אלא אמר אביי מהכא בכולם אע"פ שאמרה בלבי היה להתקדש לו אעפ"כ אינה מקודשת ואמאי הא קאמרה בלבי היה ודלמא שאני התם דכיון דאתניה לאו כל כמינה דעקרא לה לתנאיה
Yet why, seeing that he declares, 'I thought [etc.]'? But it must be because we say: A mental stipulation! - Said Abaye to him: Perhaps it is different there, for it [the ruling] is in the direction of stringency!<span class="x" onmousemove="('comment',' I.e., we may be uncertain whether a mental stipulation is valid or not. Consequently she is betrothed, in the sense that she is not free to remarry. Nevertheless, if she accepts kiddushin from another, she may be betrothed to the second, the betrothal of the first being null on account of the mental condition, and so she will require a divorce from both.');"><sup>5</sup></span>
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