Reference for Pirkei Avot 4:9

רַבִּי יוֹנָתָן אוֹמֵר, כָּל הַמְקַיֵּם אֶת הַתּוֹרָה מֵעֹנִי, סוֹפוֹ לְקַיְּמָהּ מֵעשֶׁר. וְכָל הַמְבַטֵּל אֶת הַתּוֹרָה מֵעשֶׁר, סוֹפוֹ לְבַטְּלָהּ מֵעֹנִי:

R. Yonathan says: Whoever fulfills the Torah in poverty, [being pressed for sustenance and yet forsaking his work in order to study Torah] is destined to fulfill it in wealth. And whoever forsakes the Torah out of [preoccupation with his] wealth is destined to forsake it out of poverty.

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