Exodus 4:23

and I have said unto thee, Let my son go, that he may serve me; and thou hast refused to let him go: behold, I will slay thy son, thy first-born.

Exodus 11:5

and all the first-born in the land of Egypt shall die, from the first-born of Pharaoh that sitteth upon his throne, even unto the first-born of the maid-servant that is behind the mill; and all the first-born of cattle.

Exodus 12:29

And it came to pass at midnight, that Jehovah smote all the first-born in the land of Egypt, from the first-born of Pharaoh that sat on his throne unto the first-born of the captive that was in the dungeon; and all the first-born of cattle.

Psalm 105:36

He smote also all the first-born in their land, The chief of all their strength.

Psalm 135:8

Who smote the first-born of Egypt, Both of man and beast;

Exodus 5:1

And afterward Moses and Aaron came, and said unto Pharaoh, Thus saith Jehovah, the God of Israel, Let my people go, that they may hold a feast unto me in the wilderness.

Exodus 7:16

And thou shalt say unto him, Jehovah, the God of the Hebrews, hath sent me unto thee, saying, Let my people go, that they may serve me in the wilderness: and, behold, hitherto thou hast not hearkened.

Psalm 78:51

And smote all the first-born in Egypt, The chief of their strength in the tents of Ham.

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American Standard Version Public Domain