✅ Answer: Consider the following narration:

عَنْ فَضَالَةَ عَنْ رِفَاعَةَ قَالَ سَأَلْتُ أَبَا عَبْدِ اللَّهِ عَنْ رَجُلٍ لَا یَدْرِی أَ رَکْعَةً صَلَّی أَمْ ثِنْتَیْنِ قَالَ یُعِیدُ

📚 Tahdhib, Vol. 2, p. 177

Translation: Rufa'ah said: I asked Imam Sadiq (peace be upon him) about a man who is unsure whether he has prayed one rak'ah or two. The Imam replied: He must repeat the prayer.

✅ Explanation: This is a general principle applied to the first two rak'ahs of any obligatory prayer. If one doubts whether they have prayed one or two rak'ahs in the first two rak'ahs of an obligatory prayer, they must restart the prayer from the beginning.

اللَّهُمَّ فَصَلِّ عَلَی مُحَمَّدٍ وَ آلِ مُحَمَّدٍ وَ عَجِّلْ لِوَلِیِّکَ الْفَرَجَ وَ الْعَافِیَةَ وَ النَّصْرَ