(5) باب إِذَا أَدْرَكَ الإِمَامَ وَلَمْ يُصَلِّ رَكْعَتَىِ الْفَجْرِ
Narrated Abu Hurairah:
The Messenger of Allah (ﷺ)as saying: When the iqamah is pronounced for prayer, no prayer is valid except the obligatory prayer. (RU)
Reference (RU): Sunan Abi Dawud 1266 (RU)
In-book reference (RU): Book 5, Hadith 17 (RU)
English translation (RU): Book 5, Hadith 1261 (RU)