Exodus 9

Pharoah is warned that the livestock will be plagued if the Israelites are not allowed to go. When it happened, Pharaoh still did not adhere to God's request.
Then the Egyptians were plagued with festering boils. Next, a destructive hailstorm. Still Pharoah did not believe.
Goshen, the country where the Israelites were dwelling since the days of Joseph was unaffected.