Deuteronomy 21:17

Overview - Deuteronomy 21
The expiation of an uncertain murder.
10 The usage of a captive taken to wife.
15 The first-born is not to be disinherited upon private affection.
18 A rebellious son is to be stoned to death.
22 The malefactor must not hang all night on a tree.
Treasury of Scripture Knowledge

Deuteronomy 21:17  (King James Version)
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.

by giving
Genesis 25:5 Genesis 25:6 Genesis 25:32 Genesis 25:34 ; 1 Chronicles 5:1 1 Chronicles 5:2

that he hath
Hebrew that is found with him. the beginning.
Genesis 49:3 ; Psalms 105:36

the right
Genesis 25:31-34