Sunan Abu Dawood, Chapter: Purification (Kitab Al-Taharah)

Ghudayf ibn al-Harith reported: I asked Aisha: Have you seen the Apostle of Allah (peace_be_upon_him) washing (because of defilement) at the beginning of the night or at the end? She replied: Sometimes he would take a bath at the beginning of the night and sometimes at the end. Thereupon I exclaimed: Allah is most Great. All Praise be to Allah Who made this matter accommodative. I again asked her: What do you think, did the Apostle of Allah (peace_be_upon_him) say the witr prayer (additional prayer after obligatory prayer at night) in the beginning of the night or at the end? She replied: Sometimes he would say the witr prayer at the beginning of the night and sometimes at the end. I exclaimed: Allah is most Great. All praise be to Allah Who made the matter accommodative. Again I asked her: What do you think, did the Apostle of Allah (peace_be_upon_him) recite the Qur'an (in the prayer) loudly or softly? She replied: Sometimes he would recite loudly and sometimes softly. I exclaimed: Allah is most Great. All praise be to Allah Who made the matter flexible.