Commentary for Avodah Zarah 30:10
ועוד תניא אין מוכרין להם לא זיין ולא כלי זיין ואין משחיזין להן את הזיין ואין מוכרין להן לא סדן ולא קולרין ולא כבלים ולא שלשלאות של ברזל אחד עובד כוכבים ואחד כותי
And it has further been taught: ... One should not sell them either weapons or accessories of weapons, nor should one grind any weapon for them, not may one sell them either stocks or neck-chains or ropes, or iron chains — neither to idolaters nor Cutheans.
Daf Shevui to Avodah Zarah
Yesterday we learned that one can be alone with Samaritans. That means that they are not suspected of being murderers. Nevertheless, a Jew may not sell them weapons. The reason, according to Abaye, is that they will come to sell them to idolaters.
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