Exodus 1:11-14

So the Egyptians made life hard for the Israelites. They put slave masters over them, who forced the Israelites to build the cities Pithom and Rameses as supply centers for the king. But the harder the Egyptians forced the Israelites to work, the more the Israelites grew in number and spread out. So the Egyptians became very afraid of them and demanded even more of them. They made their lives bitter. They forced the Israelites to work hard to make bricks and mortar and to do all kinds of work in the fields. The Egyptians were not merciful to them in all their painful work.