16 And these are the names of the sons of Levi according to their generations; Gershon, and Kohath, and Merari: and the years of the life of Levi were an hundred thirty and seven years.

17 The sons of Gershon; Libni, and Shimi, according to their families.

18 And the sons of Kohath; Amram, and Izhar, and Hebron, and Uzziel: and the years of the life of Kohath were an hundred thirty and three years.

19 And the sons of Merari; Mahali and Mushi: these are the families of Levi according to their generations.

20 And Amram took him Jochebed his father’s sister to wife; and she bare him Aaron and Moses: and the years of the life of Amram were an hundred and thirty and seven years.

Yesterday we read a brief account of the descendants of Reuben and Simeon, but those were simply to establish the context for today’s verses, which dive more deeply into the descendants of the third son Levi. And the reason why we are going into greater detail with the descendants of Levi is because this leads us to the birth of Aaron and Moses.

So, to summarize the connection, Levi had three sons. The middle son, Kohath, had four sons. The eldest of those, Amram, was the father of Aaron and Moses. So Moses and Aaron were the great-grandchildren of Levi. This information is helpful in getting a sense of just how long the Israelites had been in bondage. Presumably they were not enslaved during the first generation of the Israelite tribes (that of Levi), but it may have occurred in the time of Kohath or Amram. Of course, if Kohath, Amram, and Aaron and Moses were all born late in the lives of their fathers, this could still represent a gap of more than a hundred years between Israel’s entry to Egypt and its exit. The fact that the Israelites had grown to such a size that the Egyptians would fear them suggests that there was some significant passage of time before they were enslaved.

In short, it seems the Israelites were not under captivity for many centuries. There are many estimates that put it around 80 years, and that makes sense with the information given in these verses. Of course, 80 years is still long enough that the vast majority of the Israelites alive at this point would have spent their entire lives in slavery. When all one has known is a singular, deprived sort of life, it really doesn’t matter whether that situation originated just before birth, or thousands of years earlier. Either way, bondage is the entirety of that person’s existence.