Chafetz Chaim, Part Two, The Prohibition Against Rechilut, Principle 4, Opening Comments
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בּוֹ יְבֹאַר דִּינָא דִּרְכִילוּת לְעִנְיַן אִם עֶצֶם הַדָּבָר נִתְגּלָּה לוֹ בְּלֹא סִפּוּרוֹ, וְכֵיצַד יְתַקֵּן הֶעָוֹן הַזֶּה, וּבוֹ ג' סְעִיפִים.
Chofetz Chaim, Silverstein translation
In this principle there will be explained the din of rechiluth in an instance where the thing itself is known to him without the story, and how to correct this sin.