Zebulun, and Issachar, were the sons of Jacob, by Leah; hence Moses hath included both under one blessing. If we interpret the prophecy according to gospel terms, perhaps it will be found that the going out, and abiding in the tents, implies both the propagating the gospel abroad, and rejoicing in it at home. See Isaiah 9:1-2.
Related Commentaries of Deuteronomy 33:18
Deuteronomy 33:18
18 And of Zebulun he said, Rejoice, Zebulun, in thy going out; and, Issachar, in thy tents.