Reference for Avodah Zarah 93:18
בעי רבה המשתחוה למעין מימיו מהו לנסכים מאי קא מיבעיא ליה אילימא לבבואה קא סגיד או דלמא למיא קא סגיד ותיבעי ליה ספל להדיוט
Rabbah asked: What is the rule if one worshipped a spring; may its water be used for the drink-offerings? What is he asking? If it is whether the person worshipped his reflection [in the water], or perhaps he worshipped the water itself, then he should have asked about a bowl of water and its use for secular purposes!
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