The Israelites came to Egypt because of the famine that was over the whole world. Joseph was the governor of Egypt at that time and the descendants of Jacob managed to survive because of Joseph. But then, a few hundred years later after Joseph died, there arose a new king over Egypt, who did not know Joseph. And, out of fear of these foreigners on his land (cf. contemporary issues of immigrants all over the whole), the Pharaoh decided to impose a new policy against the Israelites. They were afflicted with heavy burdens and forced to build Egyptian cities. But the more they were oppressed, the more they multiplied (ha!). Of course it irked the Egyptians even more. So they ruthlessly made the people of Israel work as slaves and made their lives bitter with hard service, in mortar (chomer) and brick (lebenah), and in all kinds of work in the field (Exo 1.8-14).
In mortar and brick: it echoes how the whole earth built the tower of Babel using mortar (chomer) and brick (lebenah — Gen 11.3).
Egypt is the new Babel. Even worse, it forced other people to do the Babylonian project.
What would YHWH do, then, towards the new Babel?