Is it obligatory for a person whose excuse for breaking the fast is removed during the day to abstain from food and drink for the remainder of the day?
General Chapter
Al-Mughni
Book of Fasting
Primary text
Two rulings exist regarding one whose excuse for breaking the fast (such as menstruation ending, traveler settling, child maturing, mad person regaining sanity, disbeliever converting, or sick person recovering) is removed after the commencement of the fast day. The primary ruling mandates immediate abstinence for the rest of the day. This view is held by Abu Hanifa, al-Thawri, al-Awza'i, al-Hasan ibn Salih, and al-'Anbari. The justification is that an occurrence which, if present before dawn, necessitates fasting, should necessitate abstinence once it occurs after dawn, similar to the establishment of a ruling by testimony (Bayyinah) regarding sighting the moon.
Supporting text
The secondary ruling states that it is not obligatory for them to abstain. This is the view of Malik, al-Shafi'i, and is narrated from Jabir ibn Zayd. Ibn Mas'ud is reported to have said that whoever eats at the beginning of the day should continue eating until the end. The evidence presented is that since breaking the fast was permissible for them at the beginning of the day, they may continue to do so until the end, analogous to a continuous valid excuse.