Muwatta
Malik
موطأ مالك
07
Tahajjud
كتاب صلاة الليل
Chapter 4: The Two Rakas of Fajr
Muwatta Malik 289
Yahya related to me from Malik that he had heard that Abdullah ibn Umar missed the two Rak'ahs of dawn, and then did them after the sun rose.
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، فَاتَتْهُ رَكْعَتَا الْفَجْرِ فَقَضَاهُمَا بَعْدَ أَنْ طَلَعَتِ الشَّمْسُ .