كتاب صلاة الليل
7  
Tahajjud

Yahya related to me from Malik that he had heard that a man asked Abdullah ibn Umar whether the witr was obligatory and Abdullah ibn Umar said, "The Messenger of Allah, may Allah bless him and grant him peace, prayed witr, and the muslims prayed witr." The man began repeating his question, and Abdullah ibn Umar kept saying, "The Messenger of Allah, may Allah bless him and grant him peace, prayed witr, and the muslims prayed witr."

وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ رَجُلاً، سَأَلَ عَبْدَ اللَّهِ بْنَ عُمَرَ عَنِ الْوِتْرِ أَوَاجِبٌ هُوَ فَقَالَ عَبْدُ اللَّهِ بْنُ عُمَرَ قَدْ أَوْتَرَ رَسُولُ اللَّهِ صلى الله عليه وسلم وَأَوْتَرَ الْمُسْلِمُونَ ‏.‏ فَجَعَلَ الرَّجُلُ يُرَدِّدُ عَلَيْهِ وَعَبْدُ اللَّهِ بْنُ عُمَرَ يَقُولُ أَوْتَرَ رَسُولُ اللَّهِ صلى الله عليه وسلم وَأَوْتَرَ الْمُسْلِمُونَ ‏.‏
Sunnah.com reference : Book 7, Hadith 17
USC-MSA web (English) reference : Book 7, Hadith 17
Arabic reference : Book 7, Hadith 271