D&C 42

The Lord makes it clear that -

"...if thou lovest me thou shalt serve me and keep all my commandments.
30 And behold, thou wilt remember the poor, and consecrate of thy properties for their support that which thou hast to impart unto them, with a covenant and a deed which cannot be broken.
31 And inasmuch as ye impart of your substance unto the poor, ye will do it unto me..."  (Doctrine and Covenants | Section 42:29 - 31)

In my mind, this is the law of consecration.