Musannaf Ibn Abi Shaybah 2593 — What a man says in his bowing

Ja'far bin Burqan said: I asked Maymun about the measure of ruku' and sujud, and he said: "I do not think they should be less than three tasbihat." Ja'far said: Then I asked al-Zuhri, and he said: "When the bones settle and come to rest." I said to him: "Maymun says three tasbihat." He said: "What I am telling you is about the same as that."