"The Messenger of Allah [SAW] forbade me to wear a ring on this one and this one," meaning the forefinger and middle finger. And this is the wording of Ibn Al-Muthanna.
نَهَانِي رَسُولُ اللَّهِ ﷺ عَنِ الْخَاتَمِ فِي هَذِهِ وَهَذِهِ يَعْنِي السَّبَّابَةَ وَالْوُسْطَى وَاللَّفْظُ لاِبْنِ الْمُثَنَّى