Exodus 11:5

11:5 and all the firstborn in the land of Egypt will die, from the firstborn son of Pharaoh who sits on his throne, to the firstborn son of the slave girl who is at her hand mill, and all the firstborn of the cattle.

Exodus 12:29

The Deliverance from Egypt

12:29 It happened at midnight – the Lord attacked 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 prison, and all the firstborn of the cattle.

Psalms 78:51

78:51 He struck down all the firstborn in Egypt,

the firstfruits of their reproductive power in the tents of Ham.

Psalms 105:36

105:36 He struck down all the firstborn in their land,

the firstfruits of their reproductive power.

Psalms 135:8

135:8 He struck down the firstborn of Egypt,

including both men and animals.