Volume 1, Book 4, Number 163:
Narrated Abu Huraira:
Allah’s Apostle said, “If anyone of you performs ablution he should put water in his nose and then
blow it out and whoever cleans his private parts with stones should do so with odd numbers. And
whoever wakes up from his sleep should wash his hands before putting them in the water for ablu –
tion, because nobody knows where his hands were during sleep.”