﴿ يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوٓا۟ إِذَا قُمْتُمْ إِلَى ٱلصَّلَوٰةِ فَٱغْسِلُوا۟ وُجُوهَكُمْ وَأَيْدِيَكُمْ إِلَى ٱلْمَرَافِقِ وَٱمْسَحُوا۟ بِرُءُوسِكُمْ وَأَرْجُلَكُمْ إِلَى ٱلْكَعْبَيْنِ ۚ وَإِن كُنتُمْ جُنُبًۭا فَٱطَّهَّرُوا۟ ۚ وَإِن كُنتُم مَّرْضَىٰٓ أَوْ عَلَىٰ سَفَرٍ أَوْ جَآءَ أَحَدٌۭ مِّنكُم مِّنَ ٱلْغَآئِطِ أَوْ لَٰمَسْتُمُ ٱلنِّسَآءَ فَلَمْ تَجِدُوا۟ مَآءًۭ فَتَيَمَّمُوا۟ صَعِيدًۭا طَيِّبًۭا فَٱمْسَحُوا۟ بِوُجُوهِكُمْ وَأَيْدِيكُم مِّنْهُ ۚ مَا يُرِيدُ ٱللَّهُ لِيَجْعَلَ عَلَيْكُم مِّنْ حَرَجٍۢ وَلَٰكِن يُرِيدُ لِيُطَهِّرَكُمْ وَلِيُتِمَّ نِعْمَتَهُۥ عَلَيْكُمْ لَعَلَّكُمْ تَشْكُرُونَ ﴾

“O YOU who have attained to faith! When you are about to pray, wash your face, and your hands and arms up to the elbows, and pass your [wet] hands lightly over your head, and [wash] your feet up to the ankles. And if you are in a state. requiring total ablution, purify yourselves. But if you are ill, or are travelling, or have just satisfied a want of nature, or have cohabited with a woman, and can find no water-then take resort to pure dust, passing therewith lightly over your face and your hands. God does not want to impose any hardship on you, but wants to make you pure, and to bestow upon you the full measure of His blessings, so that you might have cause to be grateful.”

When you prepare for prayer, wash your faces...[Sahl] said:Purification consists of four things: purity of the source of food, truthfulness of the tongue, avoidance of all sins, and the humility in one�s innermost secret (sirr). In turn, each one of these four corresponds to the purification of the outer members of the body.His words, Exalted is He:�But He wishes to purify you...That is, to purify your state, your character and your actions, so that you return to Him in a state of true poverty (ḥaqīqat al-faqr) without being attached to any [secondary] cause.Purification is of seven kinds: the purification of knowledge from ignorance, the purification of remembrance from forgetfulness, the purification of obedience from disobedience, the purification of certainty from doubt, the purification of the intellect from foolishness, the purification of opinion from slander, and the purification of faith from anything which is alien to it. Furthermore, each punishment constitutes a kind of purification, except the punishment of the heart, which is hardness. [Concerning] His words, Exalted is He: