Treasury of Scripture Knowledge
But he shall acknowledge the son of the hated for the firstborn, by giving him a double portion of all that he hath: for he is the beginning of his strength; the right of the firstborn is his.
And Abraham gave all that he had unto Isaac.
1 Chronicles 5:1
Now the sons of Reuben, the firstborn of Israel, (for he was the firstborn, but because he defiled his father's bed, his birthright was given unto the sons of Joseph, the son of Israel; and he was not counted as the firstborn.
Reuben, thou art my firstborn, my might, and the beginning of my strength, principal in dignity, and the principal in power.
He smote also all the firstborn in their land, the chief of all their strength.
And Jacob said, Sell me this day thy birthright.