It wasnarrated from Zainab bint Umm Salamah that her mother saidthat herbed was in front of the place where the Messenger of Allah(ﷺ)prostrated. (RU)
English reference (RU): Vol. 1, Book 5, Hadith 957 (RU)
Arabic reference (RU): Book 5, Hadith 1010 (RU)