Commentary for Ketubot 91:7

ורבי אלעזר מאי טעמא לא אמר מהאי ההוא מיבעי ליה לכדר' פנחס בן יאיר ונשמרת מכל דבר רע מכאן אמר ר' פנחס בן יאיר אל יהרהר אדם ביום ויבא לידי טומאה בלילה

What is the reason that R. Elazar does not say [that the warning comes] from this text? That text he requires for [the same deduction] as [that made by] R. Pinchas b. Yair: “And you shall keep yourself from every evil thing”; From here R. Pinchas b. Yair said that a person should not have [impure] thoughts in his heart, and thus bring himself to have impurity at night.

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