صحیح ابن حبان
Ibn Hibban
كتاب الصوم
Book of Fasting
باب صوم الجنب - ذكر البيان بأن المرء جائز له أن يكون اغتساله من جنابته بعد طلوع الفجر ومن نيته أن يصوم يومئذ
Chapter on Fasting While Junub - Clarifying that one may bathe after dawn with the intention to fast
2 hadith
Hadith 3496
Lady Aisha Siddiqa (may Allah be pleased with her) and Lady Umm Salamah (may Allah be pleased with her), who are the wives of the Prophet (peace and blessings be upon him), narrate: Sometimes the Prophet (peace and blessings be upon him) would be in a state of major ritual impurity (janabah) at the time of true dawn due to having been with his wife, but he would still perform ghusl (ritual bath) and observe the fast.
Hadith 3497
Lady Aisha Siddiqa (may Allah be pleased with her) narrates: The Prophet Muhammad (peace be upon him) (sometimes) would be in a state of major ritual impurity (janabah) at the time of true dawn without having had a wet dream, but even then he would fast on that day.