Reference : Hisn al-Muslim 266

عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو رضي الله عنهما قَالَ: رَأَيْتُ النَّبيَّ صلى الله عليه وسلم يَعْقِدُ التَّسْبِيحَ بِيَمِينِهِ.
Abdullah bin 'Amr (RA) said: "I saw the Prophet (ﷺ) counting the 
glorification of his Lord on his right hand."

Reference:
Abu Dawud with a different wording 2/81, and At-Tirmidhi 5/521. See also 
Al-Albani, Sahihul-Jami'As-Saghir 4/271 (no. 4865).

Chapter: How the Prophet ﷺ made tasbeeh