It was narrated that Abu Burdah said:

'Ali said: "The Messenger of Allah ﷺ said to me: 'O 'Ali, ask Allah for guidance and steadfastness,' and he forbade me from placing a ring on this one and this one' - and he pointed to his forefinger and middle finger.

أَخْبَرَنَا مُحَمَّدُ بْنُ مَنْصُورٍ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ عَاصِمِ بْنِ كُلَيْبٍ، عَنْ أَبِي بُرْدَةَ، قَالَ قَالَ عَلِيٌّ قَالَ لِي رَسُولُ اللَّهِ ﷺ " يَا عَلِيُّ سَلِ اللَّهَ الْهُدَى وَالسَّدَادَ " . وَنَهَانِي أَنْ أَجْعَلَ الْخَاتَمَ فِي هَذِهِ وَهَذِهِ . وَأَشَارَ يَعْنِي بِالسَّبَّابَةِ وَالْوُسْطَى .