when writing the question out.

What did the Prophet Muhammad (saw) say about taking care of one's heels?
 Salim, the freed slave of Shaddad, said:                      I came to 'A'isha, the wife of the Holy Prophet (may peace be upon him), on the day when Sa'db. Abi Waqqas died. 'Abd al-Rahman b. Abu Bakr also came there and he performed ablution in her presence. She (Hadrat 'A'isha) said: Abd al-Rahman, complete the ablution as I heard the Allah's Messenger (may peace be upon him) say: Woe to the heels because of hell-fire.