Holdings subject to zakah
     Islam enjoined zakah on crops, fruit, livestock,    merchandise, minerals, gold, silver, and treasures.
    
Zakah on Gold and Silver: Its Obligation
     Says Allah concerning zakah on gold and silver: "... As    for those who hoard treasures of gold and silver and do    not spend them for the sake of Allah--warn them of    grievous suffering [in the life to come]" [at-Taubah 34].
    Thus, zakah is prescribed for gold and silver--whether    they are in the form of coins, ingots, or dust--as long    as the amount owned constitutes a nisab, a period of a    year has passed, debts are settled, and/or basic needs    satisfied from it.
    
Nisab of Gold and Its Due
     The minimum of nisab for gold is twenty dinars owned for    one year. Its due is a quarter of a tenth, that is, half    a dinar. For any amount over twenty dinars, a quarter of    a tenth is levied upon it. 'Ali reported that the    Prophet, upon whom be peace, said: "There is nothing upon    you in gold, until it reaches twenty dinars. Thus, if you    have twenty dinars at the end of the year, then there is    half a dinar levied on it [as zakah]. Any additional    amount will be calculated in this manner. There is no    zakah on property until it has been owned for one year."
    This hadith is related by Ahamd, Abu Dawud, and    al-Baihaqi. Al-Bukhari grades it authentic and alHafidh    verified it.
         Zuraiq, the Fazarah clan's protege, reported that 'Umar    ibn 'Abdulaziz wrote to him after he became caliph: "Take    what passes by you of the commerce of the Muslims--those    who trade with their properties--a dinar for each forty    dinars. From that which is less than forty, calculate on    the lesser amount until it reaches twenty dinars. If you    have to take one-third of a dinar, disregard it and do    not take anything on it. Afterwards, give them a written    release of what you have levied from them until the year    expires." This is related by Ibn Abu Shaibah.
         Malik says in his al-Muwatta': "The uncontroversial    tradition that we have is that the zakah due on twenty    dinars is like the zakah due on two hundred dirhams."
    Twenty dinars are equal to twenty-eight Egyptian dirhams    in weight.
    
We are identifying and building the related set of Ayahs for this Hadith. Please share your feedback and let us know if you identify any referencing issues.
"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari