Fortress of the Muslim (Hisn al-Muslim)
حصن المسلم
(131) Chapter: How the Prophet ﷺ made tasbeeh
(131) كيف كان النبي ﷺ يسبح ؟
Hisn al-Muslim 266 
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).
عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو رضي الله عنهما قَالَ: رَأَيْتُ النَّبيَّ صلى الله عليه وسلم يَعْقِدُ التَّسْبِيحَ بِيَمِينِهِ.
Reference : Hisn al-Muslim 266