זְבוּלֻ֕ן לְח֥וֹף יַמִּ֖ים יִשְׁכֹּ֑ן וְהוּא֙ לְח֣וֹף אֳנִיּ֔וֹת וְיַרְכָת֖וֹ עַל־צִידֹֽן׃ (ס)
Завулон будет обитать на берегу моря, и он будет берегом для кораблей, и его фланг будет на Зидоне.
Rashi
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)
Chizkuni
זבולון לחוף ימים ישכון, “Zevulun (his territory) will border on the ocean.” The sons of Yaakov are listed here in the order of their births. The only exception is that Zevulun although younger, is mentioned ahead of his brother Yissachar. The reason is that the territory of Yissachar was located between that of Dan and that of Zevulun. An alternate explanation: the reason why Zevulun here appears before his senior brother Yissachar was because Yaakov foresaw that in the future it would be thanks to the financial support of that tribe, that the Tribe of Yissachar could devote themselves to intensive Torah study.
Da'at Zekenim
והוא לחוף אניות, “and he shall be in ports for ships.” Having used the expression לחוף ימים in the beginning of this verse for Zevulun, Yaakov repeats the simile for the ports in which Zevulun’s ships will anchor. There are towns that are situated right next to the shores of the sea, as opposed to others which are further inland, making it more difficult for ships unloading their cargoes to transport them to their customers. They will therefore prefer to anchor further away from such shores, so that other towns will enjoy the trade generated by ships anchoring there. The shores in the territory of Zevulun will make landing and unloading there easy for these sailors.