Sahih al-Bukhari Book 61, Hadith 133
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."
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.
The Prophet (ﷺ) had informed us of the death of Ja`far and Zaid before the news of their death reached us, and his eyes were shedding tears.