Virtues of the Prayer Hall (Sutra of the Musalla)
Bukhari :: Book 1 :: Volume 9 :: Hadith 498
Narrated 'Aisha:
It is not good that you people have made us (women) equal to dogs and donkeys. No doubt I saw Allah's Apostle praying while I used to lie between him and the Qibla and when he wanted to prostrate, he pushed my legs and I withdrew them.