Zebulun and Issachar were the sixth and fifth sons born to Jacob by Leah (Genesis 30:18, 20).
in your journeys … in your tents: This phrase uses a figure of speech called a merism (a way of speaking that uses two opposite ideas to mean “everything in between”). Here, it describes the whole of life. It includes times of movement and work (journeys) and times of rest at home (tents).