Sahih Bukhari Volume 005, Book 058, Hadith Number 144.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 58. Merits of the Helpers in Madina (Ansaar)
Narated By Ibn 'Abbas : Allah's Apostle (in his fatal illness) came out wrapped in a sheet covering his shoulders and his head was tied with an oily tape of cloth till he sat on the pulpit, and after praising and glorifying Allah, he said, "Then-after, O people! The people will go on increasing, but the Ansar will go on decreasing till they become just like salt in a meal. So whoever amongst you will be the ruler and have the power to harm or benefit others, should accept the good of the good-doers amongst them and excuse the wrong-doers amongst them."