Sahih Bukhari Volume 5, Book 63, Hadith 3802

حَدَّثَنَا أَحْمَدُ بْنُ يَعْقُوبَ، حَدَّثَنَا ابْنُ الْغَسِيلِ، سَمِعْتُ عِكْرِمَةَ، يَقُولُ سَمِعْتُ ابْنَ عَبَّاسٍ ـ رضى الله عنهما ـ يَقُولُ خَرَجَ رَسُولُ اللَّهِ صلى الله عليه وسلم وَعَلَيْهِ مِلْحَفَةٌ، مُتَعَطِّفًا بِهَا عَلَى مَنْكِبَيْهِ، وَعَلَيْهِ عِصَابَةٌ دَسْمَاءُ حَتَّى جَلَسَ عَلَى الْمِنْبَرِ، فَحَمِدَ اللَّهَ وَأَثْنَى عَلَيْهِ، ثُمَّ قَالَ ‏"‏ أَمَّا بَعْدُ، أَيُّهَا النَّاسُ، فَإِنَّ النَّاسَ يَكْثُرُونَ وَتَقِلُّ الأَنْصَارُ، حَتَّى يَكُونُوا كَالْمِلْحِ فِي الطَّعَامِ، فَمَنْ وَلِيَ مِنْكُمْ أَمْرًا يَضُرُّ فِيهِ أَحَدًا أَوْ يَنْفَعُهُ، فَلْيَقْبَلْ مِنْ مُحْسِنِهِمْ، وَيَتَجَاوَزْ عَنْ مُسِيئِهِمْ ‏"‏‏

Narrated 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."