Sunan an-Nasa'i #867 · The Book of Leading the Prayer (Al-Imamah)

Sunan an-Nasa'iIt was narrated that Ibn Buhainah said
Sunan an-Nasa'i · Book 10 · The Book of Leading the Prayer (Al-Imamah)
Sunan an-Nasa'i · كتاب 10 · كتاب الإمامة
"The Iqamah for Subh prayer was said, and the Messenger of Allah (ﷺ) saw a man praying while the Mu'adhdhin saying the Iqamah. He said: 'Are you praying Subh with four Rak'ahs?
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ سَعْدِ بْنِ إِبْرَاهِيمَ، عَنْ حَفْصِ بْنِ عَاصِمٍ، عَنِ ابْنِ بُحَيْنَةَ، قَالَ أُقِيمَتْ صَلاَةُ الصُّبْحِ فَرَأَى رَسُولُ اللَّهِ صلى الله عليه وسلم رَجُلاً يُصَلِّي وَالْمُؤَذِّنُ يُقِيمُ فَقَالَ ‏
"‏ أَتُصَلِّي الصُّبْحَ أَرْبَعًا ‏"‏ ‏.‏
Reference : Sunan an-Nasa'i 867In-book reference : Book 10, Hadith 91