Muhammad bin Ibrahim bin al-Harith محمد بن إبراهيم بن الحارث · The Book on Purification

'I heard Allah's Messenger saying: 'If it were not that it would be difficult on my nation then, I would have ordered them to use the Siwak for each prayer and to delay the Isha prayer until the third of the night.'"He said: Zaid bin Khalid wouId attend the prayer in the Masjid and his Siwak would be on his ear in the location of the pen on the ear of a writer. He would not get up to pray…

"I said to Umm Salamah: 'Indeed I am a woman with lengthy hems, and I walk in places of filth.' So she said: 'Allah's Messenger said: "It is purified by what comes after it."