Full Sharh — Muwatta Malik 270
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 .
English Translation
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
Source
Muwatta Malik(موطأ مالك)
Tahajjud
Hadith Number
270
Grade
Mauquf Sahih