Sahih al-Bukhari Book 61, Hadith 132
Allah's Messenger (ﷺ) in his fatal illness came out, wrapped with a sheet, and his head was wrapped with an
oiled bandage. He sat on the pulpit, and praising and glorifying Allah, he said, "Now then, people will
increase but the Ansar will decrease in number, so much so that they, compared with the people, will
be just like the salt in the meals. So, if any of you should take over the authority by which he can
either benefit some people or harm some others, he should accept the goodness of their good people
(i.e. Ansar) and excuse the faults of their wrong-doers." That was the last gathering which the Prophet (ﷺ)
attended.
About Ibn `Abbas: `Umar bin Al-Khattab used to treat Ibn `Abbas very favorably `Abdur Rahman bin `Auf said to him. "We also have sons that are equal to him (but you are partial to him.)" `Umar said, "It is because of his knowledge." Then `Umar asked Ibn `Abbas about the interpretation of the Verse:- 'When come the Help of Allah and the conquest (of Mecca) (110.1) Ibn `Abbas said. "It portended the death of Allah's Messenger (ﷺ), which Allah had informed him of." `Umar said, "I do not know from this Verse but what you know."
Once the Prophet (ﷺ) brought out Al-Hasan and took him up the pulpit along with him and said, "This son of mine is a Saiyid (i.e. chief) and I hope that Allah will help him bring about reconciliation between two Muslim groups."