It is narrated from Amr bin Huraith (may Allah be pleased with him) that he said: I heard the Prophet (ﷺ) reciting «وَاللَّيْلِإِذَاعَسْعَسَ» in the Fajr prayer. Imam Shafi'i (may Allah have mercy on him) says: That is, in the Fajr prayer, he would recite «إِذَاالشَّمْسُكُوِّرَتْ» (Surah At-Takweer).
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 127
Hadith Takhrijاخرجه مسلم الصلاة، باب القرأة فى الصبح: 456 .