D&C 113

Elias Higbee asked the Prophet Joseph Smith - 

"...What is meant by the command in Isaiah, 52d chapter, 1st verse, which saith: Put on thy strength, O Zion—and what people had Isaiah reference to?"  (Doctrine and Covenants 113:7)

The Prophet 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)

In my mind, the reference to "hold the power of the priesthood" included priesthood keys.  I note that Moses - 

"...committed unto us the keys of the gathering of Israel from the four parts of the earth, and the leading of the ten tribes from the land of the north."  (Doctrine and Covenants 110:11)