سنن أبي داود

'Abd Allah b. Abu Qais said: I asked 'Aishah about the witr observes by the Messenger of Allah (ﷺ). She replied: Sometime he observed the witr prayer in the early hours of the night, sometimes he observed it at the end of it. I asked: How did he recite the Qur'an ? Did he recite the Qur'an quietly or loudly ? She replied: He did it in any way. Sometimes he recited quietly and sometimes loudly, sometimes he took bath and then slept and sometimes he performed ablution and then slept.

Abu Dawud said: The narrators other than Qutaibah said: This refer to his bath due to sexual defilement.