Reference for Sanhedrin 222:18
איתיביה (יהושע כא, טז) ערים תשע מאת שני השבטים האלה מאי לאו ארבע ופלגא מהאי וארבע ופלגא מהאי וש"מ חולקין עיר אחת לב' שבטים לא ארבעה מהאי וחמש מהאי
<b><i>GEMARA</i></b>. Our Rabbis taught: [If thou shalt hear say in one of thy cities… saying,] they have gone out: [this implies,] they, but not their agents.<span class="x" onmousemove="('comment',' I.e., only if the seducers of the same city personally enticed the majority of the city to idolatry. But if a number were enticed by their agents, the law of a condemned city does not apply, the enticed ones being punished as individuals. ');"><sup>33</sup></span> Men: the plural cannot mean less than two.<span class="x" onmousemove="('comment',' If only one person seduced a city, it is not treated as such. ');"><sup>34</sup></span>