Good for the righteous, good for his neighbor
When it is good for a righteous person, it is also good for those around him. Or: The presence of a righteous person also benefits those around him.
("My father said: Woe to the wicked, woe to his neighbor! It is good for the righteous, good for his neighbor!" - Sukkah Nu b.)
Translation
Expression (Hebrew)
טוֹב לַצַּדִּיק- טוֹב לִשְׁכֵנוֹ
Definition (Hebrew)
כְּשֶׁטּוֹב לְצַדִּיק טוֹב גַּם לַסּוֹבְבִים אוֹתוֹ. אוֹ: נוֹכְחוּתוֹ שֶׁל צַדִּיק מוֹעִילָה גַּם לַסּוֹבְבִים בְּקִרְבָתוֹ.
("אָמַר אַבַּיֵּי: אוֹי לָרָשָׁע אוֹי לִשְׁכֵנוֹ, טוֹב לַצַּדִּיק טוֹב לִשְׁכֵנוֹ"- סֻכָּה נוּ ע"ב)