When the Messenger of Allah ﷺ raised his head from prostration or from the bowing position, he would pause between them so long that we would say he had forgotten.
حدثنا عبد الرزاق حدثنا معمر عن ثابت
كان رسول الله ﷺ إذا رفع رأسه من السجدة أو الركعة يمكث بينهما حتى نقول أنسي ﷺ
No references are available.
Its isnad is sahih. It is found in Bukhari 2/301, no. 821, Fath, in the chapter on adhan, "Pausing between the two prostrations."