Chafetz Chaim, Part Two, The Prohibition Against Rechilut, Principle 5, Opening Comments
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בִּכְלָל זֶה יְבֹאַר אִסּוּר קַבָּלת רְכִילוּת וּשְׁמִיעָתוֹ בְּכָל פְּרָטָיו, וְגַם אִם נִכְשָׁל בָּזֶה, כֵּיצַד יְתַקֵּן הַחֵטְא הַזֶּה, וּבוֹ ז' סְעִיפִים.
Chofetz Chaim, Silverstein translation
In this principle there will be explained the issur of accepting rechiluth and of hearing it, in all of its details. And, also, if he transgresses, how to atone for this sin. It contains seven sections.