Fiqh-us-Sunnah, Volume 1: Tayammum, the dry ablution

Definition. Literally tayammum means "aim, purpose." In Islamic law, it refers to "aiming for or seeking soil to wipe one's face and hands with the intention of preparing oneself to pray, and so on."

Volume 1, Page 63a: Proof of its legitimacy

This is proven by the Qur'an, sunnah and ijma' (consensus). The Qur'an says, "And if you are ill, or on a journey, or one of you comes from relieving himself, or you have touched women, and you do not find water, then go to high clean soil and rub your face and hands (therewith). Lo, Allah is Benign, Forgiving" (an-Nisa': 43). From the sunnah we have the hadith related by Abu Umamah in which the Prophet, upon whom be peace, said, "All of the earth has been made for me and my nation a pure place of prayer. Whenever a person from my nation wants to pray, he has something with which to purify himself, that is, the earth." (Related by Ahmad.) Finally, there is a consensus that tayammum forms a legitimate part of the shari'ah, as it replaces ablution or ghusl under specific circumstances

Fiqh-us-Sunnah, Volume 1: Ghusl, the complete ablution

Ghusl means to wash the entire body with water. Says Allah in the Qur'an, "If you are sexually impure, purify yourselves." And, "They question you concerning menstruation. Say: It is an illness, so let women alone at such times and do not have sex with them until they are cleansed" (al-Baqarah 222).

Volume 1, Page 49a: Actions requiring Ghusl

The actions that require Ghusl are:

Volume 1, Page 49b: Discharge of al-Mani owing to stimulation while asleep or awake

The opinion of the jurists in general is that ghusl is a must should one have a discharge of al-mani (sperm) owing to stimulation while asleep or awake. Abu Sa'eed reported that he heard the Messenger of Allah, upon whom be peace, say, "Water (washing) is (needed) after (ejaculation of) sperm." (Related by Muslim.)

Umm Salamah reported that Umm Sulaim said, "O Messenger of Allah, Allah is not ashamed of the truth. Does a woman have to perform ghusl if she has a wet dream?" He said, "Yes, if she sees the liquid." (Related by al-Bukhari, Muslim and others.)

Fiqh-us-Sunnah, Volume 2: Supererogatory Prayers

Volume 2, Page 1a: Their significance

At-tatawwu', or nawafil or supererogatory prayers, have been legislated to make up for any deficiencies left in the performance of fard salah (obligatory prayers). In salah, there are virtues that are not found in any other form of worship. Abu Hurairah reports that the Prophet sallallahu alehi wasallam said: "The first thing that the people will be called to account for on the Day of Resurrection will be the prayers. Our Lord will say to the angels although He knows better: 'Look into the salah of my servant to see if he observed it perfectly or been negligent in it. So if he observed it perfectly it will be recorded to his credit, but if he had been negligent in it in any way, Allah would say: See if My servant has any supererogatory prayers. Then if he has any supererogatory prayers, Allah would say: Make up the deficiency in My servant's obligatory prayer with his supererogatory prayers.' Thereafter all his actions will be examined in like manner" (Abu Dawud).