Jami` at-Tirmidhi 1753
جامع الترمذي#1753Sahihحَدَّثَنَا سُوَيْدُ بْنُ نَصْرٍ، أَخْبَرَنَا ابْنُ الْمُبَارَكِ، عَنِ الأَجْلَحِ، عَنْ عَبْدِ اللَّهِ بْنِ بُرَيْدَةَ، عَنْ أَبِي الأَسْوَدِ، عَنْ أَبِي ذَرٍّ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " إِنَّ أَحْسَنَ مَا غُيِّرَ بِهِ الشَّيْبُ الْحِنَّاءُ وَالْكَتَمُ " . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ . وَأَبُو الأَسْوَدِ الدِّيلِيُّ اسْمُهُ ظَالِمُ بْنُ عَمْرِو بْنِ سُفْيَانَ .
Narrated Abu Dharr: That the Prophet (ﷺ) said: "Indeed the best of what the gray may be changed with is Henna' and Katam." [Abu 'Eisa said:] This Hadith is Hasan Sahih. Abu Al-Aswad Ad-Dili's (a narrator in this chain) name is Zalim bin 'Amr bin Sufyan
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 24:34