For 10 points, name this Pillar of Islam that is a tax for the distribution of alms.
This practice is the subject of the 24th book of the Ṣaḥīḥ al-Bukhārī, which includes a ḥadīth describing a transformation into a bald-headed poisonous snake with black spots over its eyes. Abu Bakr vowed to fight against anyone who would separate salat and this other practice, and fought against those tribes that refused to engage in this practice in the Ridda wars. Supervising this practice was a major function of the bayt al-māl. The 60th verse of the Sūrat at-Tawbah describes the eight categories of people who can benefit from this practice, like (*) stranded travelers and slaves. Ṣadaqa is a voluntary version of this practice, and khums, a related practice, was initially levied on military plunder. The usual rate for this practice is 2.5 percent of one's net worth. For 10 points, name this Pillar of Islam that is a tax for the distribution of alms.
This practice is the subject of the 24th book of the Ṣaḥīḥ al-Bukhārī, which includes a ḥadīth describing a transformation into a bald-headed poisonous snake with black spots over its eyes.
zakāt [prompt on giving alms, charity, taxation, or equivalents]