March 15

The House of Justice further points out that however weighty are the obligations resting upon the believers to pay the Huququ'lláh and to support the other funds of the Faith, these are spiritual obligations which are to be fulfilled voluntarily, and under no circumstances may contributions to any of these funds, even the Huququ'lláh, be demanded or solicited from individual believers. Appeals and exhortations must always be made to the generality of the friends, not to individuals. 
(The Universal House of Justice, from a letter dated 7 May 1980; The Compilation of Compilations, vol. I, Huququ’llah)