in Jewish tradition, the tribe of Zebulun was considered to have a symbiotic relationship with the tribe of Issachar, its neighbour and a tribe that traditionally was seen as having many scholars, whereby Zebulun would financially support Issachar's devotion to study and teaching of the Torah, in exchange for a share of the spiritual reward from such learning; the terms Issachar and Zebulun came to be used by Jews for anyone engaged in such a relationship.