Fasting: Recommended Abstinence from Things That Invalidate a Fast
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 1717
It is recommended for five types of people – even if they are not fasting – to abstain from things that invalidate a fast in the month of Ramadan:
1. A traveller who has done something that invalidates a fast and who reaches his home town or a place where he intends to stay for ten days before ẓuhr;
2. A traveller who after ẓuhr reaches his home town or a place where he intends to stay for ten days;
3. A sick person who gets better after ẓuhr; similarly, if he gets better before ẓuhr and has done something that invalidates a fast. In case he has not done anything that invalidates a fast, then based on obligatory precaution, he must fast on that day;
4. A woman whose ḥayḍ or nifās stops during the day;
5. A disbeliever who becomes a Muslim and who had done something that invalidates a fast before becoming a Muslim.