Sunan an Nasai
3624
Sahih+1

It was narrated that 'Aishah said:"They say that the Messenger of Allah made a will concerning 'Ali, may Allah be pleased with him. But he called for a vessel in which to urinate, then he went limp without me realizing it. So to whom did he leave a will?

SahihAbu Ghuddah
SahihAl-Albani