Reference for Gittin 57:1

אבל בב"ד של ישראל כיון דנפק ליה דינא לקטלא קטלי ליה

but in the case of an Israelite court once it condemns him to execution he is executed. Said Abaye to him: In an Israelite court also it is possible that some circumstance may be found in his favour [after his condemnation]? — Such a circumstance happens before the sentence is pronounced; after the sentence is pronounced it does not happen.<span class="x" onmousemove="('comment',' [I.e., it may happen but rarely (Rashi)]. ');">¹</span>

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