Musannaf Ibn Abi Shayba 3:5292

Ibn Fudayl narrated to us, from Wiqa’, from Sa’id ibn Jubayr, who said: ‘Umar ibn al-Khattab saw a man who was using prayer beads (tasabih) with him. ‘Umar said: "It is sufficient for him of that to say: 'Subhan Allah' (Glory be to Allah) to the fullness of the heavens and the earth, and to the fullness of whatever He wills of anything thereafter." And he says: "Alhamdulillah (Praise be to Allah) to the fullness of the heavens and the earth, and to the fullness of whatever He wills of anything thereafter." And he says: "Allahu Akbar (Allah is the Greatest) to the fullness of the heavens and the earth, and to the fullness of whatever He wills of anything thereafter."