The Messenger of Allah ﷺ said: “Witr is a confirmed duty; whoever wishes may perform it with three (units), and whoever wishes may perform it with five, and whoever would like to perform witr with one (unit), let him perform it with one.”

قَالَ رَسُولُ اللَّهِ ﷺ «الْوِتْرُ حَقٌّ فَمَنْ شَاءَ أَوْتَرَ بِثَلَاثٍ وَمِنْ شَاءَ أَوْتَرَ بِخَمْسٍ وَمَنْ أَحَبَّ أَنْ يُوتِرَ بِوَاحِدَةٍ فَلْيُوتِرْ بِوَاحِدَةٍ».