They shall call the people unto the mountain; there they shall offer sacrifices of righteousness: for they shall suck of the abundance of the seas, and of treasures hid in the sand. They shall call the people unto the mountain - By their traffic with the Gentiles (for so I think עמים ammim should be understood here) they shall be the instruments in God's hands of converting many to the true faith; so that instead of sacrificing to idols, they should offer sacrifices of righteousness.
They shall suck of the abundance of the seas - That is, grow wealthy by merchandise.
And of treasures hid in the sand - Jonathan ben Uzziel has probably hit upon the true meaning of this difficult passage: "From the sand," says he, "are produced looking-glasses and glass in general; the treasures - the method of finding and working this, was revealed to these tribes." Several ancient writers inform us that there were havens in the coasts of the Zebulunites in which the vitreous sand, or sand proper for making glass, was found. See Strabo, lib. xvi.; see also Pliny, Hist. Nat. l. xxxvi., c. 26; Tacitus, Hist. l. v., c. 7. The words of Tacitus are remarkable: Et Belus amnis Judaico mari illabitur; circa ejus os lectae arenae admixto nitro in vitrum excoquuntur. "The river Belus falls into the Jewish sea, about whose mouth those sands, mixed with nitre, are collected, out of which glass is formed," or which is melted into glass. Some think that the celebrated shell-fish called murex, out of which the precious purple dye was extracted, is here intended by the treasure hid in the sand: this also Jonathan introduces in this verse. And others think that it is a general term for the advantages derived from navigation and commerce.