(2) باب سَاعَاتِ الْوِتْرِ
Narrated `Aisha:
Allah's Messenger (ﷺ) offered witr prayer at different nights at various hours extending (from the `Isha' prayer) up to the last hour of the night.
Reference: Sahih al-Bukhari 996
In-book reference: Book 14, Hadith 7
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 16, Hadith 110