مسائل المنتخبه (Articles Of Islamic Acts) - الخوئي، السيد أبوالقاسم - الصفحة ٣٥٦ - OCCASIONS ON WHICH IT IS OBLIGATORY TO OBSERVE THE LAPSED FAST ONLY

(iii) If he forgets to take ceremonial bath during the month of Ramazan and mayobserve fasts for one or more days in the state of ceremonial uncleanliness.
(iv) If in the month of Ramazan a man performs without investigating as to whether the day hasdawned or not, an act, which invalidates a fast, and it becomes known later that it had dawned, and also it after investigation and in spite of thinking that it has dawned,he performs an act, which invalidates a test, and it becomes known later that it had dawned, it is obligatory on him to observe the lapsed of that fast. Rather, if he doubtsafter investigation whether it has dawned or not, and performs an act, which invalidates a test, and it becomes known later that it was dawn, he should observe the lapsed ofthe fast of that day.
(v) If someone says that it has not dawned yet, and one, on the basis of his statement, performs an act, which invalidates a fast and it becomes knownlater that it had dawned.
(vi) If someone says that it has dawned and one does not believe his word and thinks that he is jesting, and performs an act, which invalidates a fast, and it becomes knownlater that it had dawned.
(vii) If a blind person or any other person like him breaks his fast on the basis of the statement of another person and it becomes known later that the sun had not set.
(viii) When the weather is clear and one believes owing to darkness that the sun has set, and, therefore, breaks his fast, but it becomes known later that the sun had notset. In case, however, one thinKs in cloudy weather that the sun has set and breaks his fast and it becomes known later that the sun had not set, it is not necessary toobserve its qaza.
(ix) It in order to feel cool or without any reason a person rinses his mouth (i.e. turns water round in his mouth) and the I water goes into his stomach involuntarily (inwhich case he