عَنْ عَلِيٍّ رَضِيَ اللَّهُ عَنْهُ قَالَ نَهَانِي رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ أَنْ أَجْعَلَ خَاتَمِي فِي هَذِهِ السَّبَّابَةِ أَوِ الَّتِي تَلِيهَا
Sayyiduna Ali (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) forbade me from wearing a ring on the index finger or the one next to it, that is, the middle finger.