وَ رَوَى الْحَلَبِيُّ عَنْهُ ع أَنَّهُ قَالَ:
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إِذَا لَمْ تَدْرِ أَرْبَعاً صَلَّيْتَ أَوْ خَمْساً أَمْ زِدْتَ أَمْ نَقَصْتَ فَتَشَهَّدْ وَ سَلِّمْ وَ اسْجُدْ سَجْدَتَيِ السَّهْوِ بِغَيْرِ رُكُوعٍ وَ لَا قِرَاءَةٍ تَتَشَهَّدُ فِيهِمَا تَشَهُّداً خَفِيفاً.
English translationBab Ul Qaim Publications
Hadith.1019 - Al-Halabi narrated from him (the Prophet (as)) that He said: “If you are unsure whether you prayed four or five rak'ahs, or whether you added or omitted something, then perform the tashahhud (testification of faith), say salaam (greeting of peace), and prostrate two prostrations of forgetfulness without bowing or reciting (in them), and you will make a brief tashahhud in both of them.”
Translation: Bab Ul Qaim Publications·Thaqalayn link·The Arabic above is the original.