Abu Saeed Khudri reported,

The Prophet ﷺ said, "Whoever reaches the dawn without having prayed witr, there is no witr for him."

Azami 2803

Sahih

عن أبي سعيد الخدري

أن النبي ﷺ قال: من أدرك الصبح فلم يوتر، فلا وثر له.

الأعظمي 2803صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Prayer
Chapter
Witr prayer
Section
Hastening to perform Witr prayer before Fajr, and whoever deliberately delays it until Fajr rises has no Witr
Numbering
Jami al-Kamil 2803 (2nd edition)
Azami 2803