D&C 113

 The question was asked of the Prophet Joseph Smith - 

"...Put on thy strength, O Zion—and what people had Isaiah reference to?"  (Doctrine and Covenants 113:7)

He answered - 

"He had reference to those whom God should call in the last days, who should hold the power of priesthood to bring again Zion, and the redemption of Israel; and to put on her strength is to put on the authority of the priesthood, which she, Zion, has a right to by lineage; also to return to that power which she had lost."  (Doctrine and Covenants 113:8)

Which suggests to me that it would be those of the lineage of Israel "should hold the power" the Lord covenanted with Abraham -

"...in thee (that is, in thy Priesthood) and in thy seed (that is, thy Priesthood), for I give unto thee a promise that this right shall continue in thee, and in thy seed after thee (that is to say, the literal seed, or the seed of the body) shall all the families of the earth be blessed, even with the blessings of the Gospel, which are the blessings of salvation, even of life eternal."  (Abraham 2:11)