I was in a gathering of the companions of the Messenger of Allah ﷺ, and they were discussing the prayer of the Messenger of Allah ﷺ. Abu Humayd then mentioned part of this hadith and said that when he bowed, he placed his palms firmly on his knees and spread his fingers apart, then he bent his back without raising his head or pressing his cheek to the side.He continued, "When he sat after the first two rakahs, he sat on the sole of his left foot and kept his right foot upright. When he was in the fourth rakah, he rested his left hip on the ground and brought both feet out to one side."
حدثنا قتيبة بن سعيد حدثنا ابن لهيعة عن يزيد يعني ابن أبي حبيب عن محمد بن عمرو بن حلحلة
كنت في مجلس من أصحاب رسول الله ﷺ فتذاكروا صلاة رسول الله ﷺ فقال أبو حميد فذكر بعض هذا الحديث وقال فإذا ركع أمكن كفيه من ركبتيه وفرج بين أصابعه ثم هصر ظهره غير مقنع رأسه ولا صافح بخده وقال فإذا قعد في الركعتين قعد على بطن قدمه اليسرى ونصب اليمنى فإذا كان في الرابعة أفضى بوركه اليسرى إلى الأرض وأخرج قدميه من ناحية واحدة
[Sahih] Bayhaqi (2/84–85) narrated it from the hadith of Abu Dawud through this same route.Ibn Lahia, Layth bin Saad followed him in narrating it, see the following hadith.