Jami` at-Tirmidhi 1743
جامع الترمذي#1743Sahihحَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا حَاتِمُ بْنُ إِسْمَاعِيلَ، عَنْ جَعْفَرِ بْنِ مُحَمَّدٍ، عَنْ أَبِيهِ، قَالَ كَانَ الْحَسَنُ وَالْحُسَيْنُ يَتَخَتَّمَانِ فِي يَسَارِهِمَا . وَهَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ .
Narrated Ja'far bin Muhammad : Narrated from his father who said: "Al-Hasan and Al-Husain wore their ring on their left hand." This Hadith is Hasan Sahih
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:
Ahmad Muhammad ShakirSahih Muquf
Al-AlbaniSahih Muquf
Bashar Awad MaaroufHasan
Zubair Ali ZaiDaif
In-book reference: 24:24