Ruling 1159 - 1. A doubt about an act for which the time of performance has passed

With regard to someone who performs prayers in a sitting or lying position, if while reciting Sūrat al-Ḥamd or al‑tasbīḥāt al‑arbaʿah he doubts whether or not he performed sajdah or said tashahhud, he must dismiss his doubt. However, if before one starts to recite Sūrat al-Ḥamd or al‑tasbīḥāt al‑arbaʿah he doubts whether or not he performed sajdah or said tashahhud, he must perform them.