Quoting%20commentary for Avodah Zarah 40:9

ת"ר (דברים כג, י) ונשמרת מכל דבר רע שלא יהרהר אדם ביום ויבוא לידי טומאה בלילה

Our Rabbis taught: “Guard yourself from all evil things” (Deuteronomy 23:10), this means that one should not think [sexual] thoughts during the day that would to uncleanliness by night.

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