"Rejoice Zevulun in your going forth": For Zevulun was a broker, and he would take of his brothers and sell them to the Canaanites; and from the Cananites, and sell them to his brothers.
"and Yissachar in your tents (of Torah)." We are hereby taught that the tribe of Yissachar was eminent in Torah, viz. (I Chronicles 12:33) "And from the sons of Yissachar, knowers of understanding for the times."
Variantly: "and Yissachar in your tents": And thus do we find his father praising him, viz. (Bereshith 49:15) "And he saw that repose (in Torah) was good and that the land was pleasant."