Exodus 5:4

So they appointed taskmasters over them to afflict them with hard labors. And they built for Pharaoh storage cities, Pithom and Raamses.

Now it happened in those days, that Moses had grown up. And he went out to his brothers and looked on their hard labors. And he saw an Egyptian striking a Hebrew, one of his brothers.

Then the officials said to the king, “Now let this man be put to death, inasmuch as he is making the hands of the men of war who remain in this city as well as the hands of all the people limp, by speaking such words to them; for this man is not seeking peace for this people but rather calamity.”