Sahl bin Znjlh سهل بن زنجلة · The Book of Purification and its Sunnah

"The Prophet went out to urinate, and 'Umar followed him with water. He said: 'What is this, O 'Umar?' He said: 'Water.' He said: 'I have not been commanded to perform ablution every time I urinate. If I did that it would have become a Sunnah.'"

"I went for Hajj with the Prophet and he went far away to relieve himself."

'The Messenger of Allah said: 'When you get up for prayer, perform ablution properly and make the water run between your toes and your fingers.'"

"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.'"

"(The Companions) disputed in the presence of the Messenger of Allah about having a bath to cleanse oneself from sexual impurity. The Messenger of Allah said: 'As for me, I pour three handfuls of water on my head.'"