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tirmidhi:1743Qutaybah > Ḥātim b. Ismāʿīl > Jaʿfar b. Muḥammad from his father

Narrated from his father who said: "Al-Hasan and Al-Husain wore their ring on their left hand." This Hadith is Hasan Sahih.  

الترمذي:١٧٤٣حَدَّثَنَا قُتَيْبَةُ حَدَّثَنَا حَاتِمُ بْنُ إِسْمَاعِيلَ عَنْ جَعْفَرِ بْنِ مُحَمَّدٍ عَنْ أَبِيهِ قَالَ

كَانَ الْحَسَنُ وَالْحُسَيْنُ يَتَخَتَّمَانِ فِي يَسَارِهِمَا وَهَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ