For 10 points, name this Pillar of Islam which involves the giving of alms as a form of tax.
The purposes of this practice are enumerated in the 60th ayah of the Surah at-Tawbah, which indicates that it can be performed for the benefit of "those whose hearts it is necessary to conciliate." A specific form of this practice takes place mandatorily between sunset on the last day of Ramadan and the beginning of the Eid prayer. A criterion used to determine who must perform this practice is called nisab. Related practices include khums, which is practiced by the Twelvers, and a voluntary practice known as sadaqah. Its name means "purification" in Arabic. An equivalent of this practice required of non-Muslims in Muslim states is known as jizya. For 10 points, name this Pillar of Islam which involves the giving of alms as a form of tax.
The purposes of this practice are enumerated in the 60th ayah of the Surah at-Tawbah, which indicates that it can be performed for the benefit of "those whose hearts it is necessary to conciliate.
zakat [prompt on things like "almsgiving" or "taxpaying" before mentioned]