(ב) רַבָּן גַּמְלִיאֵל בְּנוֹ שֶׁל רַבִּי יְהוּדָה הַנָּשִׂיא אוֹמֵר, יָפֶה תַלְמוּד תּוֹרָה עִם דֶּרֶךְ אֶרֶץ, שֶׁיְּגִיעַת שְׁנֵיהֶם מְשַׁכַּחַת עָוֹן. וְכָל תּוֹרָה שֶׁאֵין עִמָּהּ מְלָאכָה, סוֹפָהּ בְּטֵלָה וְגוֹרֶרֶת עָוֹן. וְכָל הָעֲמֵלִים עִם הַצִּבּוּר, יִהְיוּ עֲמֵלִים עִמָּהֶם לְשֵׁם שָׁמַיִם, שֶׁזְּכוּת אֲבוֹתָם מְסַיַּעְתָּן וְצִדְקָתָם עוֹמֶדֶת לָעַד. וְאַתֶּם, מַעֲלֶה אֲנִי עֲלֵיכֶם שָׂכָר הַרְבֵּה כְּאִלּוּ עֲשִׂיתֶם:
(2) Rabban Gamliel the son of Rabbi Yehudah HaNasi said: Excellent is the study of the Torah together with a worldly occupation; for the exertion [expended] in both of them causes sin to be forgotten. And all [study of the] Torah in the absence of a worldly occupation comes to nothing in the end and leads to sin. And all who work for the community, let them work for the [sake of the] name of Heaven; for the merit of their ancestors sustains them, And their righteousness (tsidkatam) will endure forever. And as for you [who work for the community, God says:] I credit you with a great reward, as if you [yourselves] had done it [on your own].
...וְכָל הַמְקַיֵּם נֶפֶשׁ אַחַת מִיִּשְׂרָאֵל, מַעֲלֶה עָלָיו הַכָּתוּב כְּאִלּוּ קִיֵּם עוֹלָם מָלֵא.
... anyone who destroys a life is considered by the Torah to have destroyed an entire world; and anyone who saves a life is as if he saved an entire world."
(יח) כָּל הַמְזַכֶּה אֶת הָרַבִּים, אֵין חֵטְא בָּא עַל יָדוֹ. וְכָל הַמַּחֲטִיא אֶת הָרַבִּים, אֵין מַסְפִּיקִין בְּיָדוֹ לַעֲשׂוֹת תְּשׁוּבָה. משֶׁה זָכָה וְזִכָּה אֶת הָרַבִּים, זְכוּת הָרַבִּים תָּלוּי בּוֹ, שֶׁנֶּאֱמַר (דברים לג) צִדְקַת ה' עָשָׂה וּמִשְׁפָּטָיו עִם יִשְׂרָאֵל. יָרָבְעָם חָטָא וְהֶחֱטִיא אֶת הָרַבִּים, חֵטְא הָרַבִּים תָּלוּי בּוֹ, שֶׁנֶּאֱמַר (מלכים א טו) עַל חַטֹּאות יָרָבְעָם (בֶּן נְבָט) אֲשֶׁר חָטָא וַאֲשֶׁר הֶחֱטִיא אֶת יִשְׂרָאֵל:
(18) Anyone who brings merit to the many, sin does not result from him. And anyone who brings the many to sin is not given enough [time] to repent. Moshe -- who was meritorious and brought merit to the many; the merit of the many is appended to him, as it is stated (Deuteronomy 33:21), "He fulfilled the righteousness of God and His statutes with Israel." Jeroboam -- who sinned and caused the many to sin; the sin of the many is appended to him, as it is stated (I Kings 15:30), "for the sins of Jeroboam that he sinned and that he caused Israel to sin."
כל העוסק בצרכי צבור כאילו עוסק בדברי תורה.
Anyone who is involved in the welfare of the public is as if they are involved in words of Torah.
Talmud Yerushalmi Brachot
כל ישראל ערבים זה בזה.
All Jews are responsible for one another.
Gemarah Sanhedrin 27b
אל תפרוש מן הצבור.
Do not separate yourself from the community.
Mishna Avot 2:4
וכל מי שעוסקים בצרכי צבור באמונה
הקודש ברוך הוא ישלם שכרם
ויסיר מהם כל מחלה וירפא לכל גופם
ויסלח לכל עונם
וישלך ברכה והצלחה
בכל מעשי ידידם
עם כל ישראל אחיהם, ונאמר אמן.
All who are faithfully involved in the needs of the community, the Holy One Blessed be He will pay their reward
and will remove from them any illness
and will heal their bodies
and will forgive their sins
and will send blessing and success
on all the work of their hands
together will all of Israel their brothers.
Siddur- Shabbat morning after Torah reading.
צורבא מרבנן דאיכה במתא, כל מילי דמתא עליה רמיה.
רש"י:דתלמיד בקי הוא
When a Torah scholar is in a city, all affairs of the city are piled upon him.
Rashi: Providing that he is a comprehensive scholar.
Bavli Moed Katan 6a