أَخْبَرَنَا هَنَّادُ بْنُ السَّرِيِّ، عَنْ أَبِي الأَحْوَصِ، عَنْ عَاصِمِ بْنِ كُلَيْبٍ، عَنْ أَبِي بُرْدَةَ، عَنْ عَلِيٍّ، قَالَ نَهَانِي رَسُولُ اللَّهِ صلى الله عليه وسلم أَنْ أَلْبَسَ فِي إِصْبَعِي هَذِهِ وَفِي الْوُسْطَى وَالَّتِي تَلِيهَا ‏.‏

It was narrated that 'Ali said: "The Messenger of Allah [SAW] forbade me to wear (a ring) on this finger," and it was on the middle finger and the one next to it. Translation Not Available

Book Ref: Sunan An Nisai Book 48 Hadith 5287
Web Ref:  Sunan An Nisai Vol 6 Book 48 Hadith 5289