Abu Bakr bin Abdur Rahman bin Attab says that once I was present with my father in the service of Hazrat Aisha and Hazrat Umm Salama, so both of them said that sometimes the Prophet (peace be upon him) would be in a state of janabah in the morning by choice without having seen a dream, and he would complete his fast.
Hadith Referenceمسند احمد / مسند النساء / 26481
Hadith Gradingحکم دارالسلام:إسناده صحيح، خ: 1930، م: 1109 عن عائشة فقط