During the times of Chazal, it was common for non-Jews to pour wine libations as a means of serving idols. Such wine is called yayin nesech (Hebrew: יין נסך), and a Jew may not derive any benefit from this wine. Due to this concern, Chazal enacted a gezeira (decree) which forbade the use of any wine which has been poured by a non-Jew, whether or not it was intended as a form of idol worship. This wine is known as stam yeinom.
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