Reference for Avodah Zarah 26:8
אמר רב אשי אטו בהמה מאי מכניס תחת כנפי השכינה איכא אלא משום מעוטייהו וה"נ דממעטי שרי:
Ashi said: When it comes to buying animals [from idolaters] is this bringing them under the wings of the Shekhinah? Rather, it is allowed because this diminished [the possessions of the idolaters], and here too it is allowed because this diminishes their possessions.
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