أَخْبَرَنَا إِسْمَاعِيلُ بْنُ مَسْعُودٍ، قَالَ حَدَّثَنَا بِشْرٌ، قَالَ حَدَّثَنَا عَاصِمُ بْنُ كُلَيْبٍ، عَنْ أَبِي بُرْدَةَ، عَنْ عَلِيٍّ، قَالَ قَالَ لِي رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ قُلِ اللَّهُمَّ اهْدِنِي وَسَدِّدْنِي ‏"‏ ‏.‏ وَنَهَانِي أَنْ أَضَعَ الْخَاتَمَ فِي هَذِهِ وَهَذِهِ وَأَشَارَ بِشْرٌ بِالسَّبَّابَةِ وَالْوُسْطَى ‏.‏ قَالَ وَقَالَ عَاصِمٌ أَحَدُهُمَا ‏.‏

It was narrated that 'Ali said: "The Messenger of Allah [SAW] said to me: 'Say: O Allah, guide me and make me steadfast,' and he forbade me to put a ring on this one and this one" - and Bishr (one of the narrators) pointed to his forefinger and middle finger. And 'Asim said: "One of the two of them." Translation Not Available

Book Ref: Sunan An Nisai Book 48 Hadith 5212
Web Ref:  Sunan An Nisai Vol 6 Book 48 Hadith 5215