He heard the Messenger of Allah ﷺ say, "When a servant prostrates, seven limbs prostrate with him: his face, his two palms, his two knees, and his two feet."
حدثنا قتيبة بن سعيد حدثنا بكر بن مضر القرشي عن ابن الهاد عن محمد بن إبراهيم بن الحارث عن عامر بن سعد
أنه سمع رسول الله ﷺ يقول إذا سجد العبد سجد معه سبعة آراب وجهه وكفاه وركبتاه وقدماه
Its isnad is sahih, and it is a repetition of 1769. Bakr bin Mudar Qurashi is the Egyptian, client of Shurahbil bin Hasana Qurashi, Abu Muhammad. His reliability was established earlier at 1403, but his attribution as Qurashi was not mentioned in Tahdhib. Bukhari mentioned it in Kabir 1/2/95, where he said, "Qutayba wrote to us and praised him highly." In [manuscript] h, it appears as "Nasr" instead of "Mudar," which is an error we have corrected from [manuscript] k and the biographical works.