Yazid bin Harun يزيد بن هارون · The Book of Purification and its Sunnah

"The Messenger of Allah said: 'There is no prayer for one who does not have ablution, and there is no ablution for one who does not mention the Name of Allah (before it).'"

The prophet performed ablution and wiped his ears inside and out.

The Messenger of Allah said: 'Woe to the heels because of Hell-fire.'"

"Aishah saw 'Abdur-Rahman performing abluti0on, and she said: Perform ablution properly, for I heard the Messenger of Allah say: 'Woe to the Achilles' tendon because of Hell-fire.'"

The Prophet said: "Woe to the heels because of Hell-fire."

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

He saw Sa'd bin Malik wiping over his leather socks and said: "Is it you doing this?" They both went to 'Umar and Sa'd said to 'Umar: "Give my brother's son a verdict regarding wiping over leather socks." 'Umar said: "We used to wipe over our leather socks when we were with the Messenger of Allah and we do not see anything wrong with that." Ibn 'Umar said: "Even if that is after one has defecated?" He said: "Yes."

"That was a concession that was granted in the early days of Islam, then we were commanded to have a bathe after that."