Helaman 13

After commanding the Nephites to repent and turn to God, unless they do, Samuel, a Lamanite, warns -

"...behold, a curse shall come upon the land, saith the Lord of Hosts, because of the peoples' sake who are upon the land, yea, because of their wickedness and their abominations.
18 And it shall come to pass, saith the Lord of Hosts, yea, our great and true God, that whoso shall hide up treasures in the earth shall find them again no more, because of the great curse of the land, save he be a righteous man and shall hide it up unto the Lord.
19 For I will, saith the Lord, that they shall hide up their treasures unto me; and cursed be they who hide not up their treasures unto me; for none hideth up their treasures unto me save it be the righteous; and he that hideth not up his treasures unto me, cursed is he, and also the treasure, and none shall redeem it because of the curse of the land."  (Book of Mormon | Helaman 13:17 - 19)

Many in the Church have made a covenant of consecration.  I believe this is what Samuel is referring to "save he be a righteous man and shall hide it up unto the Lord".