April 7

The Pen of the Most High hath ordained that the Huququ'lláh is payable on nineteen mithqals of gold. That is, the Huquq is levied on money equalling this amount. As to other possessions in silver or otherwise, it is payable when they equal this in value, not in number. The Huququ'lláh is payable only once; for example if a person acquireth a thousand mithqals in gold and payeth the Huquq thereof, the Right of God ceaseth to be applicable to that amount, except in regard to what accrueth to it through commerce and transactions; when such profits reach the prescribed minimum, one must carry out what God hath decreed. When, however, the original sum changeth hands, the Huquq is again payable as it was the first time; in this event the Right of God must be given. 

- Baha’u’llah  (The Compilation of Compilation, vol. I, Huqúqu'lláh)