In the Qur'an
"...purify yourself (bathe your whole body)…" (Qur'an5:6)
“And purify your garments!" (Qur'an 74:4).”
“God loves those who turn to Him in repentance and purify themselves" (Qur'an 2:222)
“There you shall find men who would keep pure. God loves those who purify themselves " (Qur'an 9:108)
According to Muhammad (peace be upon him)
“Allah is Pure and loves cleanliness.”
"Cleanliness is a part of faith"
"You are soon going to meet your brothers, so tidy your saddles and clothes. Be distinguished in the eyes of the people."
"Don't ever come with your hair and beard disheveled like a devil."
"When you perform ablutions, rinse your mouth"'
"Rinse your mouth after drinking milk, because it contains fat”.
"Clean your gums from food and brush your teeth".
He (peace be upon him) described the process of cleaning one's teeth as "purification of one's mouth, and an act that is pleasing to the Lord".
The Prophet (peace be upon him) used to pray two units late at night, and then go and brush his teeth".
When the Prophet (peace be upon him) went into his home, the first action he did was to brush his teeth. Moreover, the Prophet (peace be upon him) used to brush his teeth whenever he rose at night to worship.
'Aisha (wife of the Prophet peace be upon him) reported: "The people came for Jumu'ah* prayer from their houses in the neighboring villages dressed in woolen garments on which dust was settled and this emitted a foul smell. A person among them (those who were dressed so) came to the Messenger of Allaah (peace be upon him) while he was in my house. The Messenger of Allaah (may peace he upon him) said to him: 'Were you to cleanse yourselves on this day.'"
Commentary: Meaning, "it would be nice if you take a bath and dress appropriately on this particular day"
Concerning the offensive smell of garlic, the Prophet peace be upon said:"... so cook them properly and when their smell dies out you can come to the mosque."
"You should not pass urine in stagnant water which is not flowing then (you may need to) wash in it."
"If a dog drinks from the utensil of anyone of you, it is essential to wash it seven times."
"When anyone amongst you (performs ablution) he must snuff his nostrils with water and then clean them."
"When anyone amongst you wakes up from sleep, he must not put his hand in the utensil till he has washed it three times, for he does not know where his hand was during the night."
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* Jumu'ah (Friday) refers to the congregational prayers held every Friday. It is held in place of the noon prayer and consists of a short sermon and shorter prayer of two units (The noon prayer is usually four units).
