Hadith 14

Bulugh al-Maram

Book 2: The Book of Prayer
وَلَفْظُ مُسْلِمٍ: { لَا صَلَاةَ بَعْدَ صَلَاةِ اَلْفَجْرِ } 1‏ .‏
And in the narration of Muslim:

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