‘Abdallah b. Abu Bakr b. Muhammad b. ‘Amr b. Hazm said that the letter sent by God's messenger to ‘Amr b. Hazm contained the words, “Only one who is pure must touch the Qur’an.”
‘Ammar b. Yasir reported God’s messenger as saying, “There are three whom the angels do not approach, the dead body of an infidel, one who is smeared with khaluq,* and one who is sexually defiled unless he performs ablution.”
*A liquid, yellow perfume mainly composed of saffron.
I accompanied Ibn ‘Umar who wanted to relieve himself. After doing so, in the course of his talk that day he said that a man going along a street met God’s messenger when he came out of the privy, or had passed water, and saluted him without receiving any response. Then when the man was almost going out of sight in the street God’s messenger struck his hands on a wall, wiped his face with them, struck once more and wiped his forearms, then responded to the man’s salutation, saying, “The only thing which prevented me from responding to your salutation was that I was not in a state of purity.”