(4) Prayer
كتاب الصلاة
(36c) Chapter: The Witr - Section 3
(35) باب الوتر - الفصل الثالث
Mishkat al-Masabih 1278 
Buraida said he heard God’s Messenger say, “The witr is a duty, so he who does not observe it does not belong to us; the witr is a duty, so he who does not observe it does not belong to us; the witr is a duty, so he who does not observe it does not belong to us.” Abu Dawud transmitted it.
وَعَن بُرَيْدَة قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ: «الْوَتْرُ حَقٌّ فَمَنْ لَمْ يُوتِرْ فَلَيْسَ مِنَّا الْوَتْرُ حَقٌّ فَمَنْ لَمْ يُوتِرْ فَلَيْسَ مِنَّا الْوَتْرُ حَقٌّ فَمَنْ لَمْ يُوتِرْ فَلَيْسَ مِنَّا» . رَوَاهُ أَبُو دَاوُدَ
 ضَعِيف  (الألباني)حكم :
Reference : Mishkat al-Masabih 1278
In-book reference : Book 4, Hadith 689