Exodus 5:15

Then the officers of the children of Israel came and cried
unto Pharaoh
Made their complaints to him, perhaps with tears in their eyes, being used so very ill. They little thought it was by Pharaoh's orders; they supposed he knew nothing of it, and therefore hoped to have their grievances redressed by him, but were mistaken:

saying, wherefore dealest thou thus with thy servants?
so they call themselves, they living in his country, and being under his jurisdiction, though not properly his subjects; however, he had made them his slaves, and so indeed even bondservants.