Q: Can one break his qaḍā’ fast for one reason or another?
A: He may do so before 'noon'. However, it is not permissible to break it after 'noon'; if he does so after 'noon', he should observe kaffārah, i.e. to give food to ten poor persons, one mudd (750 gr.) to each person. If he does not have it, he should fast for three — by obligatory caution, consecutive — days.