2 Nephi 1

 As Lehi blesses and warns Laman and Lemuel, he states - 

"But if ye will not hearken unto him I take away my first blessing, yea, even my blessing, and it shall rest upon him."  (2 Nephi 1:29)

As I have reviewed the words "first blessing", I have come to conclusion that the "first blessing" is the right to preside in regard to priesthood authority and keys.  This could also relate to terms like  king, boss, head, leader, etc.