Pirkei Avot §avot_02_02: Rabban Gamaliel the son of Rabbi Judah Hanasi said: excellent is the study of...

Rabban Gamaliel the son of Rabbi Judah Hanasi said: excellent is the study of the Torah when combined with a worldly occupation, for toil in them both keeps sin out of one’s mind; But [study of the] Torah which is not combined with a worldly occupation, in the end comes to be neglected and becomes the cause of sin. And all who labor with the community, should labor with them for the sake of Heaven, for the merit of their forefathers sustains them (the community), and their (the forefather’s) righteousness endures for ever; And as for you, [God in such case says] I credit you with a rich reward, as if you [yourselves] had [actually] accomplished [it all].