my firstborn.

Genesis 29:32
And Leah conceived and gave birth to a son, and she named him Reuben, for she said, "The LORD has seen my affliction. Surely my husband will love me now."

Genesis 46:8
Now these are the names of the sons of Israel (Jacob and his descendants) who went to Egypt: Reuben, Jacob's firstborn.

Genesis 48:18
"Not so, my father!" Joseph said. "This one is the firstborn; put your right hand on his head."

Numbers 1:20
From the sons of Reuben, the firstborn of Israel, according to the records of their clans and families, counting one by one the names of every male twenty years of age or older, everyone who could serve in the army,

Numbers 26:5
Reuben was the firstborn of Israel. These were the descendants of Reuben: The Hanochite clan from Hanoch, the Palluite clan from Pallu,

1 Chronicles 2:1
These were the sons of Israel: Reuben, Simeon, Levi, Judah, Issachar, Zebulun,

1 Chronicles 5:1, 3
These were the sons of Reuben the firstborn of Israel. Though he was the firstborn, his birthright was given to the sons of Joseph son of Israel, because Reuben defiled his father's bed. So he is not reckoned according to birthright. . . .

my might.

Deuteronomy 21:17
Instead, he must acknowledge the firstborn, the son of his unloved wife, by giving him a double portion of all that he has. For that son is the firstfruits of his father's strength; the right of the firstborn belongs to him.

Psalm 78:51
He struck all the firstborn of Egypt, the virility in the tents of Ham.

Psalm 105:36
Then He struck all the firstborn in their land, the firstfruits of all their vigor.