Pharaoh also said, “Look, the people of the land are now numerous, and you would be stopping them from their labor.”
Their request is humble and reasonable: only three days to journey into the desert and sacrifice to their God, a common practice among nations. They give Pharaoh the warning that neglecting God's worship will bring judgment upon Israel, and he will lose his laborers. Yet he denies them and falsely charges them with idleness, slandering the servants of God as idle and their words as vain, so he might increase their burdens.
AI summary
Commenting on Exodus 5:3-9
And Pharaoh said, behold, the people of the land now are many,.... So that if some were taken off, as suggested, there were enough of them to do business and so he cared not; but if allowed to go, they might mutiny and rebel, and give a great deal of trouble to quell them; or it may be, the sense is, they were very numerous...
And Pharaoh said, Behold, the people of the land now [are] many, and ye make them rest from their burdens. (c) As though you would rebel.