Chafetz Chaim, Part Two, The Prohibition Against Rechilut, Principle 8, Opening Comments
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בִּכְלָל זֶה יְבֹאַר דִּינֵי הַאָבָק בְּכָל עִנְיָנָיו, וּבוֹ ה' סְעִיפִים.
Chofetz Chaim, Silverstein translation
In this principle there will be explained the "dust" of rechiluth in all of its aspects. It contains five sections.