al-Walid bin Muslim al-Quraishi الوليد بن مسلم القرشي · The Book on Salat (Prayer)

Allah's Messenger said: "None should call the Adhan except for one with Wudu."

"I asked Allah's Messenger (S) about smoothening the pebbles during Salat. He said: 'If you must do so, then let it be only once.'"

"I met Thawban the freed slave of Allah's Messenger (S) and said to him, 'Guide me to a deed by which Allah benefit me, and for which Allah will admit me into Paradise.' He was silent for quite a while, then he turned to me and said: 'Perform prostrations, for I heard Allah's Messenger (S) saying: 'No worshipper performs a prostration to Allah except that by it, Allah will raise him a level, and erase a sin from him for…