Chafetz Chaim, Part Two, The Prohibition Against Rechilut, Principle 8
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עוֹד יֵשׁ דְּבָרִים, שֶׁהֵן אֲסוּרִין מִטַּעַם אֲבַק רְכִילוּת, כְּגוֹן, אִם מַה שֶּׁמְסַפֵּר לוֹ, מַה שֶּׁאָמַר פְּלוֹנִי עָלָיו, (ה) אֵינוֹ דְּבַר גְּנַאי, רַק דָּבָר, (ו) שֶׁדֶּרֶךְ בְּנִי אָדָם לְהַקְפִּיד קְצָת, כְּשֶאוֹמְרִים לוֹ בְּפָנָיו.
Chofetz Chaim, Silverstein translation
And there are other things which are forbidden because of the "dust" of rechiluth, such as revealing to another what someone said about him, which, though not demeaning, most men would object to having repeated before him.