Deuteronomy 30

 After being scattered due to not keeping their covenants, the Lord promises - 

"...when all these things are come upon thee, the blessing and the curse, which I have set before thee, and thou shalt call them to mind among all the nations, whither the Lord thy God hath driven thee,

2 And shalt return unto the Lord thy God, and shalt obey his voice according to all that I command thee this day, thou and thy children, with all thine heart, and with all thy soul;

3 That then the Lord thy God will turn thy captivity, and have compassion upon thee, and will return and gather thee from all the nations, whither the Lord thy God hath scattered thee."  (Deuteronomy 30:1–3)

Isn't it interesting that on April 3rd, 1836, in the Kirtland Temple - 

"...the heavens were again opened unto us; and Moses appeared before us, and 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)

Starting the gathering of Israel as prophesied in Deuteronomy.