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.
tirmidhi:393Hannād And Maḥmūd b. Ghaylān > Abū Muʿāwiyah > al-Aʿmash > Ibrāhīm > ʿAlqamah > ʿAbdullāh

"The Prophet (S) performed two prostrations for As-Sahw after talking."  

الترمذي:٣٩٣حَدَّثَنَا هَنَّادٌ وَمَحْمُودُ بْنُ غَيْلاَنَ قَالاَ حَدَّثَنَا أَبُو مُعَاوِيَةَ عَنِ الأَعْمَشِ عَنْ إِبْرَاهِيمَ عَنْ عَلْقَمَةَ عَنْ عَبْدِ اللَّهِ

أَنَّ النَّبِيَّ ﷺ سَجَدَ سَجْدَتَىِ السَّهْوِ بَعْدَ الْكَلاَمِ قَالَ وَفِي الْبَابِ عَنْ مُعَاوِيَةَ وَعَبْدِ اللَّهِ بْنِ جَعْفَرٍ وَأَبِي هُرَيْرَةَ