The Book of Prayer
Bulugh al-Maram #467
كتاب الصلاة
وَلِابْنِ حِبَّانَ: «مَنْ أَدْرَكَ اَلصُّبْحَ وَلَمْ يُوتِرْ فَلَا وِتْرَ لَهُ»
Ibn Hibban has:
'Whosoever reaches the dawn, and he did not offer Witr, then there is no Witr for him.'
وَلِابْنِ حِبَّانَ: "مَنْ أَدْرَكَ اَلصُّبْحَ وَلَمْ يُوتِرْ فَلَا وِتْرَ لَهُ"
'Whosoever reaches the dawn, and he did not offer Witr, then there is no Witr for him.'
— Bulugh al-Maram, Hadith 467