i.e. The Egyptian task-masters, who, by sending us abroad to gather straw, hinder us from doing the work which they require; and so they are both unjust and unreasonable. They charge the task-masters, not the king, either in civility and duty, casting his fault upon the instruments; or because they did not know, or at best not believe, that this was the king's act. Others, Thy people, i.e. the Egyptians, make themselves guilty, and will bring the vengeance of God upon them for their cruelty.
Related Commentaries of Exodus 5:16
Exodus 5:16
16 There is no straw given unto thy servants, and they say to us, Make brick: and, behold, thy servants are beaten; but the fault is in thine own people.