حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا بِشْرُ بْنُ مُفَضَّلٍ، حَدَّثَنَا يُونُسُ بْنُ عُبَيْدٍ، عَنْ مُحَمَّدِ بْنِ سِيرِينَ، قَالَ حَدَّثَنِي مَنْ، صَلَّى مَعَ النَّبِيِّ صلى الله عليه وسلم صَلاَةَ الْغَدَاةِ فَلَمَّا رَفَعَ رَأْسَهُ مِنَ الرَّكْعَةِ الثَّانِيَةِ قَامَ هُنَيَّةً ‏.‏

Narrated Someone who prayed with the Prophet: Muhammad ibn Sirin said: Someone who prayed the morning prayer along with the Prophet (PBUH) narrated to me: When he raised his head after the second rak'ah, he remained standing for a short while. Translation Not Available

Book Ref: Sunan Abi Dawud Book 8 Hadith 1446
Web Ref:  Sunan Abi Dawud Book 8 Hadith 1441