(9) باب كَرَاهَةِ الشُّرُوعِ فِي نَافِلَةٍ بَعْدَ شُرُوعِ الْمُؤَذِّنِ
Ibn Buhaina reported:
The dawn prayer had commenced when the Messen- ger of Allah (ﷺ) saw a person observing prayer, whereas the Mu'adhdhin had pronounced the Iqama. Upon this he (the Holy Prophet) remarked: Do you say four (rak'ahs) of Fard in the dawn prayer? (RU)
Reference (RU): Sahih Muslim 711 b (RU)
In-book reference (RU): Book 6, Hadith 80 (RU)
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1536 (RU)