Related על מגילה 53:16

One who sells a Torah scroll will never see a sign of blessing (i.e., he will not benefit from the sale). One who writes scrolls for tefillin and mezuzot -- they and their merchants, and the merchants' merchants (i.e., the wholesalers), and all that occupy themselves not for the sake of Heaven, they will never see a sign of blessing. If they occupy themselves for the sake of Heaven, behold, they will receive every blessing. Merchants [who sell produce] in the sabbatical year, and those who grow small livestock, and those who chop down good trees, they will never see the sign of blessing of the Most High. [But] if they occupied themselves for the sake of Heaven, behold, they will receive every blessing.