Wudu in the context of "Mosque"

Ritual purification is a ritual prescribed by a religion through which a person is considered to be freed of uncleanliness, especially prior to the worship of a deity, and ritual purity is a state of ritual cleanliness. Ritual purification may also apply to objects and places. Ritual uncleanliness is not identical with ordinary physical impurity, such as dirt stains; nevertheless, body fluids are generally considered ritually unclean.

Most of these rituals existed long before the germ theory of disease, and figure prominently from the earliest known religious systems of the Ancient Near East. Some writers connect the rituals to taboos.

Hadith sciences (Arabic: علم الحديث ʻilm al-ḥadīth "science of hadith") consists of several religious scholarly disciplines used by Muslim scholars in the study and evaluation of the hadith. ("Science" is used in the sense of a field of study, not to be confused with following the principles of observation and experiment, developing falsifiable hypotheses, etc. of modern science.) The hadith are what most Muslims believe to be a record of the words, actions, and silent approvals of the Islamic prophet Muhammad as transmitted through chains of narrators. Hadith science scholars aim to determine which of these records are authentic, and which may be fabricated.

For most Muslims, determining the authenticity of hadith is enormously important in Islam because along with the Quran, the Sunnah of the Islamic prophet—his words, actions, and silent approvals—are considered the explanation of the divine revelation (wahy), and the record of them (i.e. hadith) provides the basis of Islamic law (Sharia). In addition, while the number of verses pertaining to law in the Quran is relatively few, hadith, for many, give direction on everything from details of religious obligations (such as Ghusl or Wudu, ablutions for salat prayer), to the correct forms of salutations, to the importance of benevolence to servants. Thus, the "great bulk" of the rules of Islamic law are derived from hadith, along with the Quran as a primary source.

Salah (Arabic: ٱلصَّلَاةُ, romanized: aṣ-Ṣalāh, also spelled Salat), also known as Namaz (Persian: نماز, romanized: namāz), is the practice of formal worship in Islam, consisting of a series of ritual prayers performed at prescribed times daily. These prayers, which consist of units known as rak'ah, include a specific set of physical postures, recitation from the Quran, and prayers from the Sunnah, and are performed while facing the direction towards the Kaaba in Mecca (qibla). The number of rak'ah varies depending on the specific prayer. Variations in practice are observed among adherents of different madhahib (schools of Islamic jurisprudence). The term salah may denote worship in general or specifically refer to the obligatory prayers performed by Muslims five times daily, or, in some traditions, three times daily.

The obligatory prayers play an integral role in the Islamic faith, and are regarded as the second and most important, after shahadah, of the Five Pillars of Islam for Sunnis, and one of the Ancillaries of the Faith for Shiites. In addition, supererogatory salah, such as Sunnah prayer and Nafl prayer, may be performed at any time, subject to certain restrictions. Wudu, an act of ritual purification, is required prior to performing salah. Prayers may be conducted individually or in congregation, with certain prayers, such as the Friday and Eid prayers, requiring a collective setting and a khutbah (sermon). Some concessions are made for Muslims who are physically unable to perform the salah in its original form, or are travelling.

Ghusl (Arabic: غسل ġusl, IPA: [ˈɣʊsl]) is an Arabic term that means the full-body ritual purification which is mandatory before the performance of various Islamic activities and prayers. For any Muslim, it is performed after sexual intercourse (i.e. it is fardh), before Friday prayer and prayers for Islamic holidays, before entering the ihram in preparation for Hajj, after having lost consciousness, and after formally converting to Islam. Sunni Muslims also perform the ablution before Salat al-Tawba "Prayer of Repentance".

Ghusl is often translated as "full ablution", as opposed to the "partial ablution" or wudu وضوء that Muslims perform after lesser impurities such as urination, defecation, flatulence, deep sleep, and light bleeding (depending on the madhhab).