Reference for Moed Katan 28:12

א"ל אביי ודלמא לעיוני בדיניה דאי לא תימא הכי דיני נפשות דקתני ה"נ דקטלין ליה

For, should you not say thus, then 'capital offenses' therein mentioned would likewise mean indeed that they would have him slain; but surely thereby they [the judges] themselves would be debarred from 'rejoicing in the feast' [as is Scripturally ordained], as it is taught:<span class="x" onmousemove="('comment',' Sanh., Sonc. ed. p. 430.');">¹⁴</span> Says R'Akiba: Whence may it be shown that a Sanhedrin [Court] that put a [sinning] soul to death do not taste [food] all that day?

Jastrow