https://torah.org/learning/business-halacha-5757-vol3no15/
A “Yissachar – Zevulun” relationship is an actual partnership between a person who studies Torah and someone who financially supports him in this endeavor. In other words, the “Zevulun”, who spends his day involved in business, gives “Yissachar”, who studies Torah, half of the profits that he receives from all business activities that he is involved in from the time that they made this agreement, even if this will amount to a large sum of money. In return, “Zevulun” receives half of the reward that “Yissachar” deserves for his Torah study. In heaven it is considered just as if “Zevulun” himself had studied this Torah.
How is this related to Bitachon?
