Sahih Bukhari Volume 8, Book 82, Hadith 6613

حَدَّثَنَا عَبْدَانُ، أَخْبَرَنَا عَبْدُ اللَّهِ، أَخْبَرَنَا يُونُسُ، عَنِ الزُّهْرِيِّ، قَالَ حَدَّثَنِي أَبُو سَلَمَةَ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏"‏ مَا اسْتُخْلِفَ خَلِيفَةٌ إِلاَّ لَهُ بِطَانَتَانِ بِطَانَةٌ تَأْمُرُهُ بِالْخَيْرِ وَتَحُضُّهُ عَلَيْهِ، وَبِطَانَةٌ تَأْمُرُهُ بِالشَّرِّ وَتَحُضُّهُ عَلَيْهِ، وَالْمَعْصُومُ مَنْ عَصَمَ اللَّهُ ‏"‏‏.‏

Narrated By Abu Said Al-Khudri : That the Prophet said, "No Caliph is appointed but has two groups of advisors: One group advises him to do good and urges him to adopt it, and the other group advises him to do bad and urges him to adopt it; and the protected is the one whom Allah protects."