Chapter: “Do not ask the people of the Scripture about anything.”
Narrated Humaid bin 'Abdur-Rahman that he heard Mu'awiya talking to a group of people from Quraish at Al-Madina, and on mentioning Ka'b Al-Ashbar, he said, "He was one of the most truthful of those who used to talk about the people of the Scripture, yet we used to detect certain faults in his information."
Reference
Sahih al-Bukhari 7361
In-book reference
Book 96, Hadith 88
USC-MSA web (English)
Vol. 1, Book 92, Hadith 459
Arabic Text
وَقَالَ أَبُو الْيَمَانِ أَخْبَرَنَا شُعَيْبٌ، عَنِ الزُّهْرِيِّ، أَخْبَرَنِي حُمَيْدُ بْنُ عَبْدِ الرَّحْمَنِ، سَمِعَ مُعَاوِيَةَ، يُحَدِّثُ رَهْطًا مِنْ قُرَيْشٍ بِالْمَدِينَةِ، وَذَكَرَ كَعْبَ الأَحْبَارِ فَقَالَ إِنْ كَانَ مِنْ أَصْدَقِ هَؤُلاَءِ الْمُحَدِّثِينَ الَّذِينَ يُحَدِّثُونَ عَنْ أَهْلِ الْكِتَابِ، وَإِنْ كُنَّا مَعَ ذَلِكَ لَنَبْلُو عَلَيْهِ الْكَذِبَ.