Arabic (Original)
أَخْبَرَنَا أَبُو طَاهِرٍ الْفَقِيهُ أنبأ أَبُو بَكْرٍ مُحَمَّدُ بْنُ الْحُسَيْنِ الْقَطَّانُ ثنا أَبُو الْأَزْهَرِ ثنا أَبُو أُسَامَةَ عَنِ ابْنِ أَبِي لَيْلَى عَنْ عَامِرٍ قَالَ صَلَّى بِنَا الْمُغِيرَةُ بْنُ شُعْبَةَ فَقَامَ فِي الرَّكْعَتَيْنِ فَسَبَّحُوا بِهِ فَلَمْ يَجْلِسْ فَلَمَّا سَلَّمَ سَجَدَ سَجْدَتَيِ السَّهْوِ ثُمَّ قَالَ رَأَيْتُ النَّبِيَّ ﷺ يَصْنَعُ ذَلِكَ وَقَدْ رُوِّينَا مِنْ حَدِيثِ الْمَسْعُودِيِّ عَنْ زِيَادِ بْنِ عِلَاقَةَ عَنِ الْمُغِيرَةِ بْنِ شُعْبَةَ مِثْلَهُ وَحَدِيثُ ابْنِ بُحَيْنَةَ فِي السُّجُودِ قَبْلَ السَّلَامِ أَصَحُّ مِنْ ذَلِكَ وَاللهُ أَعْلَمُ
English Translation
Amir said: Al-Mughirah ibn Shu'bah led us in prayer and he stood up in the [first] two rak'ahs. They said 'SubhanAllah' to him but he did not sit down. When he gave the salam, he prostrated two prostrations of forgetfulness. Then he said: 'I saw the Prophet (peace be upon him) do likewise.' It was also narrated from al-Mas'udi from Ziyad ibn Ilaqah from al-Mughirah ibn Shu'bah similarly. The hadith of Ibn Buhaynah regarding prostrating before the salam is more authentic than that. And Allah knows best.