Maliks Muwatta Book 002, Hadith Number 005.

Section : How to do Wudu.

Yahya related to me from Malik that he had heard that Abd ar-Rahman ibn Abi Bakr was visiting A'isha, the wife of the Prophet, may Allah bless him and grant him peace, on the day that Sad ibn Abi Waqqas died, and he asked for some water to do wudu. A'isha said to him, ''Abd ar-Rahman! Perform your wudu fully, for I heard the Messenger of Allah, may Allah bless him and grant him peace, say, 'Woe to the heels in the fire.'"