Tafsiran Ulangan 33:18: Rashi, Chizkuni, Da'at Zekenim & Ramban

ולזבולן אמר AND OF ZEBULUN HE SAID — These five tribes whom he blessed last, Zebulun, Gad, Dan, Naphtali and Asher, it repeats their names in order to instil them with strength and power, because they were the weakest of all the tribes. They are the very same whom Joseph took to Pharaoh, as it is said, (Genesis 47:2, cf. Rashi thereon) “And of the least of his brothers he took five men [and placed them before Pharaoh]” — because these looked weak, so that he (Pharaoh) should not appoint them his war officers (Bava Kamma 92a).

שמח זבולון, “rejoice Zevulun;” he had complained about the portions of ancestral land he had drawn. We read in the Talmud tractate Megillah, folio 6 That he complained about having received mountainous territory and sandy territory alongside the ocean, compared to Naftaly who had been given apparently fruitful earth in the mountainous regions, as had most other tribes. (Deborah praised this tribe in her victory song in Judges 5,18 as literally having mocked death in the constant danger as a seafaring tribe. When Zevulun had seen Naftaly completely exposed, as the other tribes simply failed to respond to Deborah’s call to arms, he responded without hesitation. Foreseeing all this in a prophetic vision, Moses is trying to calm Zevulun for having received his share near the beaches of the ocean where they would be far less exposed than Naftaly; would he have preferred to have been exposed to the dangers Naftaly faced?) It will be explained soon how Zevulun in fact benefited by his territory facing the ocean.

שמח זבולון בצאתך, ”Rejoice Zevulun when you are going out!” Zevulun would travel to Tzidon and Tzur in Lebanon as well as to more distant destinations. This is why Moses blessed them, wishing them success in their endeavours