Sahih Muslim Book 4, Hadith Number 1037.

Chapter : The excellence of the prayer and the way it is begun and the excellence of Ruku’ and moderation in it and prostration and moderation in it, etc.

‘Urwa b. Zubair reported: ‘Aisha asked: What disrupts the prayer? We said: The woman and the ass. Upon this she remarked: Is the woman an ugly animal? I lay in front of the Messenger of Allah (may peace be upon him) like the bier of a corpse and he said prayer.