(52) باب النَّهْىِ عَنِ الْخَاتَمِ، فِي السَّبَّابَةِ
It was narrated that Abu Burdah said:
'Ali said: "The Messenger of Allah [SAW] 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.
Reference: Sunan an-Nasa'i 5210
In-book reference: Book 48, Hadith 171
English translation: Vol. 6, Book 48, Hadith 5213