´It was narrated that Abu Hurairah said:` "The Messenger of Allah (ﷺ) aid: 'When the Iqamah for prayer is said, there is no prayer except the prescribed prayer."'
Hadith ReferenceSunan an-Nasa'i / The Book of Leading the Prayer (Al-Imamah) / Hadith: 866
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم