For example, some one vows to fast if he succeeds in doing of an illegal work or leaving an obligatory duty, this vow and its fast will be forbidden. If she is woman, she must not be in menstrual cycle or childbirth situation. Fast should not be caused that he becomes sick or his sickness becomes harder. Man sees crescent of the moon by himself. Two equitable witnesses testify.
Islamic judge announces that the new moon has begun or finished.
If proving of new moon was doubtful, man should not fast as Ramadhan. Since intention is necessary in other worship, the fast needs intention too, so the fast without intention is not acceptable. Intention means that a man intends to fast and avoids of things which break fast. Enema Vomiting A woman who is menstrual irregular discharges has to do ritual ablution for prayer. If she does not do so, her fast won't be acceptable.