Sahih Bukhari Volume 7, Book 71, Hadith Number 612.

Narrated By ‘Aisha: (The wife of the Prophet) When the health of Allah’s Apostle deteriorated and his condition became serious, he asked the permission of all his wives to allow him to be treated In my house, and they allowed him. He came out, supported by two men and his legs were dragging on the ground between Abbas and another man. (The sub-narrator told Ibn ‘Abbas who said: Do you know who was the other man whom ‘Aisha did not mention? The sub-narrator said: No. Ibn Abbas said: It was ‘Ali.) ‘Aisha added: When the Prophet entered my house and his disease became aggravated, he said, “Pour on me seven water skins full of water (the tying ribbons of which had not been untied) so that I may give some advice to the people.” So we made him sit in a tub belonging to Hafsa, the wife of the Prophet and started pouring water on him from those water skins till he waved us to stop. Then he went out to the people and led them in prayer and delivered a speech before them.