Reference for Pesachim 24:5

(אלא) אמר אביי עדות מסורה לזריזים חמץ לכל מסור

A man may err in an hour and a trifle, let us eat until the end of the fifth hour? - Said Abaye: Testimony is committed to careful men,<span class="x" onmousemove="('comment',' A man does not come to testify without being very careful on the question of time, as he knows that he will be cross-examined.');">⁵</span> [whereas] leaven is committed to all.<span class="x" onmousemove="('comment',' Every man uses his own judgment, and therefore a far wider margin of error is possible.');">⁶</span>

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