Exodus 8

Moses and Aaron ask Pharaoh to let the Hebrews go, and warns him that a plague of frogs would come next. Pharaoh's heart is hardened and he refuses. The magicians are able to replicate this feat. Once the plague is in full effect, Pharaoh asks Moses to take it away.

Then the plague of lice descends upon the Egyptians. The magicians are unable to replicate this. They acknowledge that this is the true God. The lice affects all Egyptians and their animals. Ironically, this is not bad enough to make Pharoah ask Moses to take the plague away.

The plague of flies makes Pharoah ask Moses to intercede and take the flies away. The magicians are not noted as having attempted to replicate this feat. God makes the distinction between Israel and Egypt, saying Israel will not be affected. Pharaoh rescinds the agreement to let the Hebrews leave for three days.