حَدَّثَنَا عَلِيُّ بْنُ خَشْرَمٍ، أَخْبَرَنَا أَبُو بَكْرٍ ـ يَعْنِي ابْنَ عَيَّاشٍ ـ قَالَ: سَمِعْتُ الْمُغِيرَةَ يَقُولُ: «لَمْ يَكُنْ يَصْدُقُ عَلَى عَلِيٍّ رَضِيَ اللَّهُ عَنْهُ فِي الْحَدِيثِ عَنْهُ إِلَّا مِنْ أَصْحَابِ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ».
Translation: ʿAlī ibn Khashram narrated to us; Abū Bakr—meaning Ibn ʿAyyāsh—informed us: “I heard al-Mughīrah say, ‘No one spoke truthfully about ʿAlī in reporting from him except those among the students of ʿAbd Allāh ibn Masʿūd.’”
Al-Nawawī records two vocalizations. يَصْدُقُ (ya-ṣduqu: active) means “would speak truthfully about ʿAlī”; يُصَدَّقُ (yu-ṣaddaqu: passive) means “would be believed when reporting about ʿAlī.” The printed original above retains the active reading. He also notes that مِنْ can be read as specifying the class or as grammatically additional.
The speaker is the hadith critic al-Mughīrah ibn Miqsam. His exceptional wording identifies a trusted transmission circle in his historical assessment; it is not a universal judgment that every other narrator necessarily lied, nor is it a statement of Ibn Masʿūd or the Prophet ﷺ.