Matters relating to As-Saum (Fasting) Riyad as-Salihin 1244
Arabic hadith text
وعن عائشة رضي الله عنها قالت: كان رسول الله صلى الله عليه وسلم يدركه الفجر وهو جنب من أهله ثم يغتسل ويصوم ((متفق عليه))
Translation
'Aishah (May Allah be pleased with her) reported
The Messenger of Allah (ﷺ) would wake up at Fajr time in a state of Janabah; so he would take bath before dawn and observe fasting.[Al-Bukhari and Muslim].