(a) Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) narrates: I saw the Messenger of Allah (peace and blessings be upon him) counting the tasbih on his right hand.
(b) In one narration: he used to count the tasbih in the prayer.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3368