<div>I am looking for a Chazal (maybe), on which a shiur by R' Yaakov Weinberg zt"l was largely based (the shiur is "The Essense of Chanuka", available at <a href="http://aishaudio.com">aishaudio.com</a>). </div>
<div> </div>
<div>As told, the Yavanim would wait until Shabbos and then go out to find the caves in which Jews were hiding in order to kill them (the Jews) while they (again the Jews) were defenseless. This slaughter went on until Matisyahu told everyone that pikuach nefesh is dochah Shabbos.
</div>
<div> </div>
<div>Of course, there are questions on this (not the least of which is you didn't need Matisyahu to know that PN is dochah Shabbos) and the shiur answers many of them. But my question is simply if anyone could point me to the source of this...Chazal? Rishon?
</div>
<div> </div>
<div>Thank you and a Lichtige Chanuka,</div>
<div>Elchanan Schulgasser</div>