Mistakes in Salah (Prayer) of Three or Four Rak‘at

6. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from certain persons of his people who has said the following: “Abu ‘Abdullah عليه السلام, about the case of one who performs Salah (prayer) and doubts if he has prayed two, three, or four Rak‘ah, has said, ‘ He stands up and performs two Rak’ah in a standing position. He then says the phrase of offering greeting of peace, then performs two Rak’ah in a sitting position, and says the phrase of offering greeting of peace. If, in fact, they were four Rak’ah the two Rak’ah become optional; otherwise, they complete the four Rak’ah.’”