How valid is the statement that one who breaks his fast through intercourse during the day of Ramadan must make up the fast?

The questioner : How valid is the statement that one who breaks his fast through intercourse must pay an expiation and make up the day? It is known from the hadith that there is an expiation; if making up the fast is valid, what is its evidence?

The Shaykh : There are narrations in which al-Hafiz Ibn Hajar al-Asqalani states that the Prophet (peace and blessings be upon him) ordered the one who broke his fast through intercourse to make up a day. As Ibn Hajar himself says, the individual chains of these narrations are weak, but their collective weight gives the ruling strength. This is the basis for the opinion that making up the fast is obligatory for the one who broke his fast through intercourse, in addition to the well-known severe expiation.