Sahih Bukhari Volume 1, Book 10, Hadith 819

حَدَّثَنَا أَبُو النُّعْمَانِ، قَالَ حَدَّثَنَا حَمَّادٌ، عَنْ أَيُّوبَ، عَنْ أَبِي قِلاَبَةَ، أَنَّ مَالِكَ بْنَ الْحُوَيْرِثِ، قَالَ لأَصْحَابِهِ أَلاَ أُنَبِّئُكُمْ صَلاَةَ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ وَذَاكَ فِي غَيْرِ حِينِ صَلاَةٍ، فَقَامَ، ثُمَّ رَكَعَ فَكَبَّرَ ثُمَّ رَفَعَ رَأْسَهُ، فَقَامَ هُنَيَّةً، ثُمَّ سَجَدَ ثُمَّ رَفَعَ رَأْسَهُ هُنَيَّةً، فَصَلَّى صَلاَةَ عَمْرِو بْنِ سَلِمَةَ شَيْخِنَا هَذَا‏.‏ قَالَ أَيُّوبُ كَانَ يَفْعَلُ شَيْئًا لَمْ أَرَهُمْ يَفْعَلُونَهُ، كَانَ يَقْعُدُ فِي الثَّالِثَةِ وَالرَّابِعَةِ‏

Narrated By Abu Qilaba : Once Malik bin Huwairith said to his friends, "Shall I show you how Allah's Apostle used to offer his prayers?" And it was not the time for any of the compulsory congregational prayers. So he stood up (for the prayer) bowed and said the Takbir, then he raised his head and remained standing for a while and then prostrated and raised his head for a while (sat up for a while). He prayed like our Sheikh 'Amr Ibn Salama. (Aiyub said, "The latter used to do a thing which I did not see the people doing i.e. he used to sit between the third and the fourth Rak'a).