based on the provisions written by the Báb and provides for distribution of the deceased's estate among seven categories of heirs.: children, spouse, father, mother, brothers, sisters, and teachers, with higher categories obtaining a larger share. In cases where some of the categories of heirs do not exist, the share falls partly to the children and partly to the Local Spiritual Assembly. The distribution among heirs is uneven: children receive nine parts; the spouse receives eight; the father, seven; the mother, six; the brothers, five; the sisters, four; and the teachers, three. Backbiting and gossip Gossip and backbiting are prohibited and viewed as particularly damaging to the individual and their relationships. Backbiting, speaking of the faults of others in their absence, is described as the greatest sin and the most hated human characteristic. This practice is seen as having a deeply negative effect on the community as well as the individuals involved. "On no subject are the Baháʼí teachings more emphatic than on the necessity to abstain from fault-finding and backbiting while being ever eager to discover and root out our own faults and overcome our own failings. ..." Alcohol, drugs and tobacco Baháʼís are forbidden to drink alcohol or to take drugs, except by a doctor's order, because God has given human beings reason which is taken away by intoxicants that lead the mind astray. The non-medicinal use of opium and other mind-altering drugs is particularly condemned in the Baháʼí scriptures. Baháʼís are also asked to try to avoid working in jobs that involve the manufacturing or large-scale sale of alcohol and to avoid any involvement in the drug trade. Smoking tobacco is not forbidden but is discouraged. Slavery Baháʼu'lláh formally abolished the practice of slave trading among Baháʼís in the Kitáb-i-Aqdas in 1873. ʻAbdu'l-Bahá and Shoghi Effendi, the authoritative interpreters of the Baháʼí writings, later saw this as a prohibition of slavery itself. Huqúqu'lláh and giving to funds Huqúqu'lláh, the "Right of God", is a law which requires Baháʼís to pay 19% of their surplus net-worth (i.e. those things that they do not need to live comfortably), after the discharge of all debts. The sum is calculated annually; however, it is paid only if the annual net worth amount increases - if their net worth stays the same or decreases the amount of Huqúqu'lláh is zero. Payment is an individual spiritual obligation, and is seen as a spiritual