Hadith 1072
Chapter 27: The Qunut during the Subh prayer - كتاب التطبيق
أَخْبَرَنَا إِسْمَاعِيلُ بْنُ مَسْعُودٍ، قَالَ حَدَّثَنَا بِشْرُ بْنُ الْمُفَضَّلِ، عَنْ يُونُسَ، عَنِ ابْنِ سِيرِينَ، قَالَ حَدَّثَنِي بَعْضُ، مَنْ صَلَّى مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم صَلاَةَ الصُّبْحِ فَلَمَّا قَالَ " سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ " . فِي الرَّكْعَةِ الثَّانِيَةِ قَامَ هُنَيْهَةً .
It was narrated that Ibn Sirin said:
"Some of those who prayed the Subh prayer with the Messenger of Allah (ﷺ) narrated to me that when he said: Sami'Allahu liman hamidah (Allah hears those who praise Him)' in the second rak'ah, he stood for a while."
Reference : Sunan an-Nasa'i 1072
In-book reference : Book 12, Hadith 44