Deuteronomy
Chapter
Deuteronomy is a sequel to Numbers. Narrated in it are three speeches and two poems, spoken by Moses in Moab before the crossing of Jordan, in which he gives the Ten Commandments to the chosen people. A minor narrative in three of the chapters tells of the last days of Moses.
Deuteronomy 21
21:17 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.