Commentary for Avodah Zarah 30:13
א"ר דימי בר אבא כדרך שאסור למכור לעובד כוכבים אסור למכור ללסטים ישראל ה"ד אי דחשיד דקטיל פשיטא היינו עובד כוכבים
Rav Dimi bar Abba said: Just as it is forbidden to sell weapons to a non Jew it is also forbidden to sell to a Jewish robber. what is the case? If he is suspected of murder then it is obvious, it is no different then a non Jew
Daf Shevui to Avodah Zarah
Dimi b. Abba extends the prohibition of selling weapons to Jewish robbers. The Talmud explains that this refers even to a robber not known to murder. The robber referred to here is even one who is sneaky, more of a thief than a robber. The thief may not intend to murder, but if he gets caught, he might commit murder in order to save himself. Therefore, one should not sell weapons to them.
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