What is the ruling on the fast of one who had intercourse with his wife after the ‘Isha’ call to prayer in Ramadan and did not perform ghusl until after the Fajr call to prayer?

The fast of one who wakes up in a state of janabah (major ritual impurity) is valid, whether the janabah resulted from intercourse or otherwise. Many hadiths indicate this, such as the hadith of Aisha and Umm Salama, who reported that the Prophet (peace be upon him) would wake up in a state of janabah due to intercourse and then fast in Ramadan.

The majority of scholars have agreed on the validity of the fast of one in a state of janabah. They considered the hadith of Abu Hurayrah, "Whoever wakes up in a state of janabah has no fast," to be abrogated or interpreted as referring to what is superior, meaning that it is better for one in a state of janabah to perform ghusl (ritual bath) before Fajr, but if they perform it after Fajr, it is permissible, and their fast is valid.