Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
nasai-kubra:1255Yaḥyá b. Ḥabīb b. ʿArabī > Ḥammād > Khālid > Abū Qilābah > Abū al-Muhallab > ʿImrān b. Ḥuṣayn

The Prophet ﷺ prayed three (rak'ahs) then said the taslim. Al-Khirbaq said: "You prayed three." So he led them in praying the remaining rak'ah, then he said the taslim, then he did the two prostrations of forgetfulness, then he said the taslim (again). (Using translation from Nasāʾī 1331)  

الكبرى للنسائي:١٢٥٥أَخْبَرَنَا يَحْيَى بْنُ حَبِيبِ بْنِ عَرَبِيٍّ قَالَ حَدَّثَنَا حَمَّادٌ قَالَ حَدَّثَنَا خَالِدٌ عَنْ أَبِي قِلَابَةَ عَنْ أَبِي الْمُهَلَّبِ عَنْ عِمْرَانَ بْنِ حُصَيْنِ

أَنَّ النَّبِيَّ ﷺ صَلَّى ثَلَاثًا ثُمَّ سَلَّمَ فَقَالَ الْخِرْبَاقُ إِنَّكَ صَلَّيْتَ ثَلَاثًا فَصَلَّى بِهِمُ الرَّكْعَةَ الْبَاقِيَةَ ثُمَّ «سَلَّمَ ثُمَّ سَجَدَ سَجْدَتَيِ السَّهْوِ ثُمَّ سَلَّمَ»  


See similar narrations below:

Collected by Nasāʾī, Nasāʾī's Kubrá
nasai:1331Yaḥyá b. Ḥabīb b. ʿArabī > Ḥammād > Khālid > Abū Qilābah > Abū al-Muhallab > ʿImrān b. Ḥuṣayn

The Prophet ﷺ prayed three (rak'ahs) then said the taslim. Al-Khirbaq said: "You prayed three." So he led them in praying the remaining rak'ah, then he said the taslim, then he did the two prostrations of forgetfulness, then he said the taslim (again).  

النسائي:١٣٣١أَخْبَرَنَا يَحْيَى بْنُ حَبِيبِ بْنِ عَرَبِيٍّ قَالَ حَدَّثَنَا حَمَّادٌ قَالَ حَدَّثَنَا خَالِدٌ عَنْ أَبِي قِلاَبَةَ عَنْ أَبِي الْمُهَلَّبِ عَنْ عِمْرَانَ بْنِ حُصَيْنٍ

أَنَّ النَّبِيَّ ﷺ صَلَّى ثَلاَثًا ثُمَّ سَلَّمَ فَقَالَ الْخِرْبَاقُ إِنَّكَ صَلَّيْتَ ثَلاَثًا فَصَلَّى بِهِمُ الرَّكْعَةَ الْبَاقِيَةَ ثُمَّ سَلَّمَ ثُمَّ سَجَدَ سَجْدَتَىِ السَّهْوِ ثُمَّ سَلَّمَ  

nasai-kubra:610Yaḥyá b. Ḥabīb b. ʿArabī > Ḥammād > Khālid > Abū Qilābah > Abū al-Muhallab > ʿImrān b. Ḥuṣayn

The Prophet ﷺ prayed three (rak'ahs) then said the taslim. Al-Khirbaq said: "You prayed three." So he led them in praying the remaining rak'ah, then he said the taslim, then he did the two prostrations of forgetfulness, then he said the taslim (again). (Using translation from Nasāʾī 1331)  

الكبرى للنسائي:٦١٠أَخْبَرَنَا يَحْيَى بْنُ حَبِيبِ بْنِ عَرَبِيٍّ قَالَ حَدَّثَنَا حَمَّادٌ قَالَ حَدَّثَنَا خَالِدٌ عَنْ أَبِي قِلَابَةَ عَنْ أَبِي الْمُهَلَّبِ عَنْ عِمْرَانَ بْنِ حُصَيْنٍ

أَنَّ النَّبِيَّ ﷺ صَلَّى ثَلَاثًا ثُمَّ سَلَّمَ فَقَالَ الْخِرْبَاقُ «إِنَّكَ صَلَّيْتَ ثَلَاثًا فَصَلَّى بِهِمُ الرَّكْعَةَ الْبَاقِيَةَ ثُمَّ سَلَّمَ ثُمَّ سَجَدَ سَجْدَتَيِ السَّهْوِ ثُمَّ سَلَّمَ»