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.
muslim:2095Abū Bakr b. Khalāad al-Bāhilī > ʿAbd al-Raḥman b. Mahdī > Ḥammād b. Salamah > Thābit > Anas

Anas reported that the ring of Allah's Apostle ﷺ was on this, and he pointed toward the little finger of his left hand.  

مسلم:٢٠٩٥وَحَدَّثَنِي أَبُو بَكْرِ بْنُ خَلاَّدٍ الْبَاهِلِيُّ حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ عَنْ ثَابِتٍ عَنْ أَنَسٍ قَالَ

كَانَ خَاتِمُ النَّبِيِّ ﷺ فِي هَذِهِ وَأَشَارَ إِلَى الْخِنْصَرِ مِنْ يَدِهِ الْيُسْرَى