Man Lā Yaḥḍuruh al-Faqīh #1013"I asked him about a man who prayed Dhuhr five rak'ahs. He said: 'If he does not know whether he sat in the fourth rak'ah or not, let him...
Man Lā Yaḥḍuruh al-Faqīh #1015“If you are unsure whether you prayed four or five rak'ahs, or whether you added or omitted something, then perform the tashahhud...