Sahih Muslim Book - 5, Hadith - 1270

وَحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ حَدَّثَنَا لَيْثٌ ح قَالَ وَحَدَّثَنَا ابْنُ رُمْحٍ أَخْبَرَنَا اللَّيْثُ عَنِ ابْنِ شِهَابٍ عَنِ الأَعْرَجِ عَنْ عَبْدِ اللَّهِ ابْنِ بُحَيْنَةَ الأَسْدِىِّ حَلِيفِ بَنِى عَبْدِ الْمُطَّلِبِ أَنَّ رَسُولَ اللَّهِ -صلى الله عليه وسلم- قَامَ فِى صَلاَةِ الظُّهْرِ وَعَلَيْهِ جُلُوسٌ فَلَمَّا أَتَمَّ صَلاَتَهُ سَجَدَ سَجْدَتَيْنِ يُكَبِّرُ فِى كُلِّ سَجْدَةٍ وَهُوَ جَالِسٌ قَبْلَ أَنْ يُسَلِّمَ وَسَجَدَهُمَا النَّاسُ مَعَهُ مَكَانَ مَا نَسِىَ مِنَ الْجُلُوسِ.

It was narrated from 'Abdullah bin Buhainah Al-Asadi, the allies of Banu 'Abdul-Muttalib, that the Messenger of Allah (s.a.w) stood up during Zuhr prayer when he should have sat. When he finished his prayer, he prostrated twice, saying the Takbir with each prostration while he was sitting and before saying the Taslim, and the people prostrated with him, to compensate for the sitting that he had forgotten.