كتاب الصلاة
2  
The Book of Prayer
Bulugh al-Maram 375
Narrated 'Abdullah bin Buraidah (RA) from his father:
Allah's Messenger (ﷺ) said: "The Witr is a duty, so he who does not offer it, is not one of us." [Reported by Abu Dawud with a Laiyin (weak) chain of narrators and Al-Hakim graded it Sahih (authentic)].
وَعَنْ عَبْدِ اَللَّهِ بْنِ بُرَيْدَةَ , عَنْ أَبِيهِ قَالَ : قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ اَلْوِتْرُ حَقٌّ, فَمَنْ لَمْ يُوتِرْ فَلَيْسَ مِنَّا } أَخْرَجَهُ أَبُو دَاوُدَ بِسَنَد لَيِّنٍ, وَصَحَّحَهُ اَلْحَاكِمُ .‏ 1‏ .‏
Reference : Bulugh al-Maram 375
In-book reference : Book 2, Hadith 375
English translation : Book 2, Hadith 370
Hadith Text
Reference