The "Right of God"—Huqúqulláh—is voluntary contribution of 19% on certain increases in wealth after expenses, paid once in a lifetime on each particular increase. But this compilation reveals it's far more than a financial law. It's described as spiritual obligation that purifies wealth, acknowledges God's sovereignty over material possessions, and transforms one's relationship with money. The legislation is surprisingly detailed: what counts as increase, what expenses can be deducted, which assets are exempt (primary residence, tools of one's trade), when payment becomes obligatory. Letters and guidance clarify gray areas: inheritance, business profits, gradual vs. sudden wealth, inflation adjustments. But the spiritual dimension pervades—this isn't tax collection but willing offering that only exists when given freely. Pressure or coercion would void its spiritual purpose. The compilation shows how ancient law adapts to modern economics while maintaining its essential character. Interesting fact: Bahá'í institutions are instructed never to remind anyone about Huqúqulláh or even mention who has or hasn't paid—it must remain entirely voluntary to retain its spiritual meaning.

This compilation brings together the original legislation from Bahá'u'lláh (1817-1892) in his book of laws, the Kitáb-i-Aqdas, along with clarifications from 'Abdu'l-Bahá (1844-1921) and Shoghi Effendi (1897-1957), and detailed guidance from the Universal House of Justice (elected since 1963). The Universal House of Justice, seated in Haifa, Israel, is the supreme governing body of the Bahá'í Faith, responsible for legislating on matters not explicitly covered in Bahá'í scripture. This codification represents decades of institutional development translating ancient revelation into modern application.