The Rings (Insignia)
Al-Kāfi|Volume 6|Book 7|Chapter 21
وَ بِهَذَا الْإِسْنَادِ قَالَ كَانَ عَلِيٌّ وَ الْحَسَنُ وَ الْحُسَيْنُ ( صلوات الله عليهم ) يَتَخَتَّمُونَ فِي أَيْسَارِهِمْ .
12. Through the same chain of narrators as that of the previous Hadith the following is narrated: “Abu ‘Abd Allah عليه السلام, has said that Ali, al-Hassan and al-Husayn, ‘Alayhim al-Salam, would wear the ring on their left hands.’”
- Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (2/356)
- Ṣaḥīḥ al-Kāfī