Muwatta Imam Malik Book of Tahajjud, Hadith 17

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 ﷺ prayed witr, and the muslims prayed witr." The man began repeating his question, and Abdullah ibn Umar kept saying, "The Messenger of Allah ﷺ 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 ﷺ وَأَوْتَرَ الْمُسْلِمُونَ . فَجَعَلَ الرَّجُلُ يُرَدِّدُ عَلَيْهِ وَعَبْدُ اللَّهِ بْنُ عُمَرَ يَقُولُ أَوْتَرَ رَسُولُ اللَّهِ ﷺ وَأَوْتَرَ الْمُسْلِمُونَ .