It was narrated that 'Ali said:

"The Messenger of Allah ﷺ 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."

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