(60) باب مَا يُكْرَهُ مِنَ الصَّلاَةِ عِنْدَ الإِقَامَةِ
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 fourRak'ahs?"'
Reference: Sunan an-Nasa'i 867
In-book reference: Book 10, Hadith 91
English translation: Vol. 1, Book 10, Hadith 868