Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
tabarani:2539 – Muḥammad b. ʿAbdullāh al-Ḥaḍramī > Ṭāhir b. Abū Aḥmad > Maʿn b. ʿĪsá > Sulaymān b. Bilāl > Jaʿfar from his father

[Machine] He said, "Al-Hasan used to seal with his left hand."  

الطبراني:٢٥٣٩ – حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللهِ الْحَضْرَمِيُّ ثنا طَاهِرُ بْنُ أَبِي أَحْمَدَ ثنا مَعْنُ بْنُ عِيسَى عَنْ سُلَيْمَانَ بْنِ بِلَالٍ عَنْ جَعْفَرٍ عَنْ أَبِيهِ

أَنَّهُ قَالَ «كَانَ الْحَسَنُ يَتَخَتَّمُ فِي يَسَارِهِ»  

See similar narrations below:

Collected by Ṭabarānī
tabarani:2540 – Muḥammad b. ʿAbdullāh al-Ḥaḍramī > Muḥammad b. ʿUbaydullāh al-Muḥāribī > Ḥātim b. Ismāʿīl > Jaʿfar b. Muḥammad from his father > Kān

[Machine] Al-Hasan ibn Ali used to wear a ring on his left hand.  

الطبراني:٢٥٤٠ – حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللهِ الْحَضْرَمِيُّ ثنا مُحَمَّدُ بْنُ عُبَيْدِ اللهِ الْمُحَارِبِيُّ ثنا حَاتِمُ بْنُ إِسْمَاعِيلَ عَنْ جَعْفَرِ بْنِ مُحَمَّدٍ عَنْ أَبِيهِ قَالَ

«كَانَ الْحَسَنُ بْنُ عَلِيٍّ ؓ يَتَخَتَّمُ فِي يَسَارِهِ»