الحديث 1191
وَعَنِ ابْنِ عُمَرَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «الْوَتْرُ رَكْعَةٌ مِنْ آخر اللَّيْل» . رَوَاهُ مُسلم
ترجمة sunnah.com، ليست من لفظ الكتاب
He reported God’s Messenger as saying, “The witr* is a rak'a at the end of the night.” * Literally ‘single’, or ‘odd’, used of an odd number of rak'as prayed at some time during the night. Muslim transmitted it.