مسائل المنتخبه (Articles Of Islamic Acts) - الخوئي، السيد أبوالقاسم - الصفحة ٢٥٧ - DOUBTS IN CONNECTION WITH PRAYERS

after bowing, he should ignore his doubt.
١١٨١. It a person doubts in the state of standing up whether or not he has performed prostrationor tashahhud he should return and perform it.
١١٨٢. If a person, who is offering prayers in sitting or lying posture, doubts at the time of reciting Tasbihat Arbaah whether or not he has performed prostrationor tashahhud, he should ignore his doubt, and if he doubts before he engages himself in reciting Surah al-Hamd or Tasbihat Arbaah whether or not he has performed prostrationor tashahhud, he should perform it.
١١٨٣. If a person doubts whether or not he has performed one of the basic elements (Rukn) of prayers and he has not yet engaged himself in an act which comes afterit, he should perform it. For example, if he doubts before reciting tashahhud whether or not he has performed two prostrations he should perform the same. And if herecollects later that he had already performed that rukn his prayers will become void on account of a rukn having become in excess.
١١٨٤. If a person doubts whether or not he has performed an act which is not a basic elements of the prayers, and if he has not engaged himself in an act whichcomes after it, he should perform it. For example, ii he doubts before reciting surah whether or not he has recited Surah al-Hamd he should recite Hamd. And if he recollectsafter reciting Hamd that he has already recited it, his prayers is in order, because an excessive rukn has not taken place.
١١٨٥. If a person doubts whether or not he has performed a rukn for example if he is busy in tashahhud and doubts whether or not he has performed two prostrationsand ignores his doubt and recollects later that he has not performed that rukn he should perform it if he has not become busy with the next rukn. However, if he has engagedhimself in the next rukn his prayers is void. For example if he recollects before the