ENOfficial
Ibn ‘Umar reported the Prophet (ﷺ) as saying, "Make the last of your prayer at night a witr.” Muslim transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنِ ابْنِ عُمَرَ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «اجْعَلُوا آخِرَ صَلَاتِكُمْ بِاللَّيْلِ وترا» . رَوَاهُ مُسلم
sunnah.com