Hadithcore
Hadith #2101960

And in the narration of Muslim:

"There is no Salat (prayer) after the Fajr (morning) prayer."

وَلَفْظُ مُسْلِمٍ: { لَا صَلَاةَ بَعْدَ صَلَاةِ اَلْفَجْرِ } [1]‏ .‏

References2 variants
Sunnah.com reference
Book 2, Hadith 14
Arabic/English book reference
Book 2, Hadith 0