مسائل المنتخبه (Articles Of Islamic Acts) - الخوئي، السيد أبوالقاسم - الصفحة ٢٦١ - IV One Who Doubts Too Much (Kathirush shak)

performed, and the follower doubts about the number of units, the follower should ignore his doubt.
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VI. Doubt in Recommended Prayers
١٢٠٢. If a person doubts about the number of units of a recommended prayers performed by him and the doubt on the side of excess makes the prayers void he shouldassume that he has performed the lesser number of units. For example, if he is doubtful as to whether he has performed ٢ units or ٣ in connection with the dawn recommendedprayers, he should assume that he has performed ٢ units only. If, however, doubts about the side of excess does not nullify the prayers (e.g. if the person offering prayersis doubtful as to whether he has performed ٢ units or ١, he is free to act on the basis of doubt about either side and the prayers offered by him will be in order.
١٢٠٣. If a rukn (basic elements) becomes less it invalidates Nafila (recommended prayers), but if it becomes excessive it does not invalidate it. Hence if theperson offering prayers forget to perform one of the acts of Nafila and recollects it when he has engaged himself in the bowing, which succeeds it, he should perform it, andshould perform the bowing again. For example if he recollects during bowing that he has not recited Surah n[-Hamd he should return and recite Surah al-Hamd. and then go intobowing again.
١٢٠٤. It a person doubts about one of the acts of Nafila whether it be a rukn or otherwise if its stage has not passed, he should perform it, and if its stage haspassed, he should ignore his doubt.
١٢٠٥. If in a recommended prayers consisting of two units a person thinks that he has offered ٣ units or more, he should ignore his doubt, and his prayers is in order. In case, however, he thinks that he has offered ٢ units or.less than that, he should act according to the strength of his doubt. for example, if