Exo 11:5, 13:2 | ESV | STEP | and every firstborn in the land of Egypt shall die , from the firstborn of Pharaoh who sits on his throne , even to the firstborn of the slave girl who is behind the handmill , and all the firstborn of the cattle .

b ver. 12, 13, 15; ch. 22:29, 30; 34:19; Lev. 27:26; Num. 3:13; 8:16, 17; 18:15; Deut. 15:19; Cited Luke 2:23

Exodus 11:5

5 and every firstborn in the land of Egypt shall die, from the firstborn of Pharaoh who sits on his throne, even to the firstborn of the slave girl who is ^abehind the handmill, and all the firstborn of the cattle.

Exodus 13:2

2 ^b“Consecrate to me all the firstborn. Whatever is the first to open the womb among the people of Israel, both of man and of beast, is mine.”