D&C 72

 For those who desired to move to and live in "Zion", the Lord instructs - 

"Thus it cometh out of the church, for according to the law every man that cometh up to Zion must lay all things before the bishop in Zion.

16 And now, verily I say unto you, that as every elder in this part of the vineyard must give an account of his stewardship unto the bishop in this part of the vineyard—

17 A certificate from the judge or bishop in this part of the vineyard, unto the bishop in Zion, rendereth every man acceptable, and answereth all things, for an inheritance, and to be received as a wise steward and as a faithful laborer..."  (Doctrine and Covenants 72:15–17)

The "law" was that the person was willing to consecrate their property to the poor and the needy.  In my mind again - 

"...every man equal according to his family, according to his circumstances and his wants and needs."  (Doctrine and Covenants 51:3)

...or the law of the Celestial kingdom