Musannaf Ibn Abi Shayba 3:587

Hushaym narrated to us, from Abd al-Hamid ibn Ja’far al-Ansari, from Muhammad ibn ‘Amr ibn ‘Ata, who said: I saw Abu Humayd al-Sa’idi with ten men from the companions of the Messenger of Allah, may Allah bless him and grant him peace. He said to them: "Shall I not tell you about the Messenger of Allah, may Allah bless him and grant him peace?" They said: "Go ahead." He said: "I saw him, when he raised his head from bowing, he would remain standing until every bone returned to its place, then he would descend prostrating and say the takbir."