The Messenger of Allah (sallallahu alayhi wa sallam) would wake up at Fajr time in a state of Janabah; so he would take bath before dawn and observe fasting.
وعن عائشة رضي الله عنها
قالت: كان رسول الله صلى الله عليه وسلم يدركه الفجر وهو جنب من أهله ثم يغتسل ويصوم
The Messenger of Allah (sallallahu alayhi wa sallam) would wake up at Fajr time in a state of Janabah; so he would take bath before dawn and observe fasting.
Who passed it on, from Imam an-Nawawi back to the one who was there.
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