Exo 1:11 Therefore they set taskmasters over them to afflict them with heavy burdens. They built for Pharaoh store cities, Pithom and Raamses.

Exo 2:11 One day, when Moses had grown up, he went out to his people and looked on their burdens, and he saw an Egyptian beating a Hebrew, one of his people.
Exo 5:4 But the king of Egypt said to them, “Moses and Aaron, why do you take the people away from their work? Get back to your burdens.”
Exo 5:5 And Pharaoh said, “Behold, the people of the land are now many, and you make them rest from their burdens!”
Exo 6:6 Say therefore to the people of Israel, I am the Lord, and I will bring you out from under the burdens of the Egyptians, and I will deliver you from slavery to them, and I will redeem you with an outstretched arm and with great acts of judgment.
Exo 6:7 I will take you to be my people, and I will be your God, and you shall know that I am the Lord your God, who has brought you out from under the burdens of the Egyptians.
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