Musnad Ahmad 1153:114

Sufyan narrated to us, from Ibn ‘Ajlan, from Sa‘id ibn Abi Sa‘id, from Abu Salamah: ‘Abd al-Rahman performed ablution in the presence of ‘Aishah. She said: “O ‘Abd al-Rahman, perform the ablution thoroughly, for I heard the Messenger of Allah (peace and blessings of Allah be upon him) say: ‘Woe to the heels from the Fire.’”