When did he appoint him by will

Bukhari :: Book 4 :: Volume 51 :: Hadith 4

Narrated Al-Aswad:

In the presence of 'Aisha some people mentioned that the Prophet had appointed 'Ali by will as his successor. 'Aisha said, "When did he appoint him by will? Verily when he died he was resting against my chest (or said: in my lap) and he asked for a wash-basin and then collapsed while in that state, and I could not even perceive that he had died, so when did he appoint him by will?"

Bukhari :: Book 4 :: Volume 51 :: Hadith 5

Narrated Sad bin Abu Waqqas:

The Prophet came visiting me while I was (sick) in Mecca, ('Amir the sub-narrator said, and he disliked to die in the land, whence he had already migrated). He (i.e. the Prophet) said, "May Allah bestow His Mercy on Ibn Afra (Sad bin Khaula)." I said, "O Allah's Apostle! May I will all my property (in charity)?" He said, "No." I said, "Then may I will half of it?" He said, "No". I said, "One third?" He said: "Yes, one third, yet even one third is too much. It is better for you to leave your inheritors wealthy than to leave them poor begging others, and whatever you spend for Allah's sake will be considered as a charitable deed even the handful of food you put in your wife's mouth. Allah may lengthen your age so that some people may benefit by you, and some others be harmed by you." At that time Sad had only one daughter.

Bukhari :: Book 4 :: Volume 51 :: Hadith 6

Narrated Ibn 'Abbas:

I recommend that people reduce the proportion of what they bequeath by will to the fourth (of the whole legacy), for Allah's Apostle said, "One-third, yet even one third is too much."