One does not speak a person's praise in his presence
See: "One mentions part of a person's praise in his presence and all of it not in his presence."
-
Translation
Expression (Hebrew)
אֵין אוֹמְרִים שִׁבְחוֹ שֶׁל אָדָם בְּפָנָיו
Definition (Hebrew)
רְאֵה: "אוֹמְרִים מִקְצָת שִׁבְחוֹ שֶׁל אָדָם בְּפָנָיו וְכֻלּוֹ שֶׁלֹּא בְּפָנָיו".
-