´It was narrated that Ibn Buhainah said:` "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?"'
Hadith ReferenceSunan an-Nasa'i / The Book of Leading the Prayer (Al-Imamah) / Hadith: 868
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:متفق عليه