Commentaire sur La Genèse 49:13

לחוף ימים TOWARDS THE COASTS OF THE SEAS — (לחוף is the same as על חוף): by the shore of the seas will be his land. הוף means “border” as Onkelos has it; old French marche; English border. [והוא לחוף אניות] means he will constantly be at the haven of ships — the port — whither the ships bring merchandise. For Zebulun was engaged in business and provided food for the tribe of Issachar whilst these engaged in the study of the Torah. It is to this that Moses alludes, (Deuteronomy 33:18) “Rejoice Zebulun in thy going out. and Issachar in thy tents”, — Zebulun goes forth to trade and Issachar studies the Torah in the tents (Midrash Tanchuma, Vayechi 11; cf. Rashi on Genesis ישב אהלים 25:27)

לחוף ימים, the beaches of the sea which was sort of rubbing the shore, חופף. If you were to ask what good this was seeing the shore was so high that one could not descend to the water to buy merchandise from the ships, Yaakov adds

Zevulun will settle. See Rashi. Zevulun’s blessing precedes that of Yissachar both here and Devarim (33:18) because Torah study is impossible unless someone provides the scholars with their basic needs. For the same reason the study is accredited to scholar and supporter alike.