Old Testament
Exodus
The Fourth Plague: Flies · 8:20–32
8:23 And I will put a division between my people and thy people: to morrow shall this sign be.
8:25 And Pharaoh called for Moses and for Aaron, and said, Go ye, sacrifice to your God in the land.
8:30 And Moses went out from Pharaoh, and intreated the LORD.
8:32 And Pharaoh hardened his heart at this time also, neither would he let the people go.