Musar for Sanhedrin 162:14
<big><strong>גמ׳</strong></big> מנא ידעינן אמר רב בעדות מיוחדת ושמואל אמר שלא בהתראה
Now there he is not flagellated:<span class="x" onmousemove="('comment',' So that there is no flagellation to afford a basis for presumption. ');"><sup>12</sup></span>
Orchot Tzadikim
One ought to be zealous against sinners and the wicked, to strive with them and to rebuke them. As our Sages said : "A man who cohabitates with a heathen woman, the zealous ones should smite him" (Sanhedrin 81b).
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