Page 458 - BERESHIT

violation of halachah. Stores which sell non-kosher food, are open on
Shabbat, or sell obscene material, give the kelippah a ‘foot in the door,’
if we use that money to fund a yeshiva. Without question, it would be best
to refrain from taking such money, if one could manage without. This is
akin to Yaakov, who did not want Lavan to have any influence over him.