אבות ב׳Pirkei Avot 2

Mishnah 1א׳

רַבִּי אוֹמֵר, אֵיזוֹהִי דֶרֶךְ יְשָׁרָה שֶׁיָּבֹר לוֹ הָאָדָם, כֹּל שֶׁהִיא תִפְאֶרֶת לְעוֹשֶׂיהָ וְתִפְאֶרֶת לוֹ מִן הָאָדָם. וֶהֱוֵי זָהִיר בְּמִצְוָה קַלָּה כְבַחֲמוּרָה, שֶׁאֵין אַתָּה יוֹדֵעַ מַתַּן שְׂכָרָן שֶׁל מִצְוֹת. וֶהֱוֵי מְחַשֵּׁב הֶפְסֵד מִצְוָה כְּנֶגֶד שְׂכָרָהּ, וּשְׂכַר עֲבֵרָה כְנֶגֶד הֶפְסֵדָהּ. וְהִסְתַּכֵּל בִּשְׁלשָׁה דְבָרִים וְאִי אַתָּה בָא לִידֵי עֲבֵרָה, דַּע מַה לְּמַעְלָה מִמְּךָ, עַיִן רוֹאָה וְאֹזֶן שׁוֹמַעַת, וְכָל מַעֲשֶׂיךָ בַסֵּפֶר נִכְתָּבִין:

Rabbi [Yehuda haNasi] said: Which is the straight path that a person should choose for himself? Whichever [path] that is [itself] praiseworthy for the person adopting [it], And praiseworthy to him from [other] people. And be as careful with a light commandment as with a weighty one, for you do not know the reward given [for the fulfillment] of [the respective] commandments. Also, weigh the loss [that may be sustained through the fulfillment] of a commandment against the reward [that may be obtained] for [fulfilling] it. And [weigh] the gain [that may be obtained through the committing] of a transgression against the loss [that may be sustained] by [committing] it. Keep your eye on three things, and you will not come to sin: Know what is above you: An Eye that sees, and an Ear that hears, and all your deeds are written in a book.

Mishnah 2ב׳

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:

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].