It was narrated that ‘Ali said: “The Messenger of Allah صلی اللہ علیہ وآلہ وسلم said to me: ‘Say: 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.” (Sahih)