Abbas bin Sahl said that Abu Humayd, Abu Usayd, Sahl bin Sa'd and Muhammad bin Maslamah (may Allah be pleased with them) were gathered together and were discussing the prayer of the Messenger of Allah (peace and blessings be upon him). Abu Humayd (may Allah be pleased with him) said: I know the prayer of the Messenger of Allah (peace and blessings be upon him) better than all of you. Then he described its complete manner, and when he mentioned prostration he said: He (peace and blessings be upon him) raised his head from the (first) prostration until every joint returned to its place.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2747