Sunan Ibn Majah, Volume 2, Book 5, Hadith 912 (DarusSalam) ⓘ
It was narrated that Wa’il bin Hujr said: “I saw the Prophet making a circle with his thumb and middle finger, and raising the one next to it (the index finger), supplicating with it during the Tashah-hud.”
حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ إِدْرِيسَ، عَنْ عَاصِمِ بْنِ كُلَيْبٍ، عَنْ أَبِيهِ، عَنْ وَائِلِ بْنِ حُجْرٍ، قَالَ رَأَيْتُ النَّبِيَّ ـ صلى الله عليه وسلم ـ قَدْ حَلَّقَ الإِبْهَامَ وَالْوُسْطَى وَرَفَعَ الَّتِي تَلِيهِمَا يَدْعُو بِهَا فِي التَّشَهُّدِ .
also referenced under: Hadith 912 (Reference) & Book 5, Hadith 965 (In-Book)