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."
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