Ye are idle, etc. Compare Exodus 5:8. Pharaoh is evidently pleased with his "happy thought." It seems to him clever, witty, humorous, to tax overworked people with idleness; and equally clever to say to religious people—"Your religion is a mere pretence.
You do not want to worship. You want a holiday." We may remark further that idleness and hypocrisy were two sins of the deepest dye, according to Egyptian notions.