Exodus 12:29 - 30 - It happened at midnight, that Yahweh struck all the firstborn in the land of Egypt, from the firstborn of Pharaoh who sat on his throne to the firstborn of the captive who was in the dungeon; and all the firstborn of livestock. Pharaoh rose up in the night, he, and all his servants, and all the Egyptians; and there was a great cry in Egypt, for there was not a house where there was not one dead.
Numbers 21:6 - Yahweh sent fiery serpents among the people, and they bit the people. Many people of Israel died.
Exodus 9:12 - Yahweh hardened the heart of Pharaoh, and he didn't listen to them, as Yahweh had spoken to Moses.
Exodus 8:15 - But when Pharaoh saw that there was a respite, he hardened his heart, and didn't listen to them, as Yahweh had spoken.
Exodus 8:17 - They did so; and Aaron stretched out his hand with his rod, and struck the dust of the earth, and there were lice on man, and on animal; all the dust of the earth became lice throughout all the land of Egypt.