Deuteronomy 33:18

Thou shalt prosper; and have cause of rejoicing. In thy going out; either,

1. To war, as this phrase is oft used, as Genesis 14:17, which was in part verified, Judges 5:18. Or,

2. To sea, in way of traffic, because their portion lay near the sea. Or both may be joined; and in both respects his course is opposite to that of Issachar, who was a lover of peace and pasturage. See Genesis 49:14,15. Issachar is here joined with Zebulun, both because they were brethren by father and mother too, and because their possessions lay near together. In thy tents, i.e. thou shalt give thyself to the management of land and cattle, living quietly in thy own possessions, disliking the troubles of war and of merchandise. So the phrase is used Genesis 25:27 Joshua 22:4 Judges 5:24, Judges 7:8.