Ibn Ishaq محمد بن إسحاق بن يسار‎ · The Book of Purification and its Sunnah

The Messenger of Allah used to remember Allah in all circumstances.

"The Messenger of Allah and his wives used to take a bath from a single vessel."

The Messenger of Allah performed ablution, then he turned inside out the woolen garment that he was wearing and wiped his face with it.

The Messenger of Allah kissed one of his women (i.e., wives), then he went to perform the prayer, and he did not perform ablution. I ('Urwah bin Zubair) said: "That was not anyone but you,' and she smiled."

"The Messenger of Allah would perform ablution, then he would kiss, then he would perform prayer without performing ablution again. And sometimes he did that with me."

"I asked 'Aishah about wiping over the leather socks and she said: 'Go to 'Ali and ask him, for he knows more about that than I do.' So I went to 'Ali and asked him about wiping. He said: 'The Messenger of Allah used to tell us that the resident could wipe for one day and one night, and the traveler could do so for three days.'"

"I asked whether the Messenger of Allah prayed voluntary prayer when traveling, but I could not find anyone to tell me until Umm Hani' bint Abu Talib told me that he had come during the year of the Conquest (of Makkah). He ordered that a screen be held up, and that was done, and he took a bath; then he prayed eight Rak'ah (units) of voluntary prayer."