“Witr is Haqq.* Whoever wishes let him pray Witr with five (Rak’ah), and whoever wishes let him pray Witr with three (Rak’ah), and whoever wishes let him pray Witr with one (Rak’ah).” (Using translation from Ibn Mājah 1190)
أَنَّ النَّبِيَّ ﷺ قَالَ إِنَّ الْوِتْرَ حَقٌّ فَمَنْ شَاءَ أَوْتَرَ بِخَمْسٍ وَمَنْ شَاءَ أَوْتَرَ بِثَلَاثٍ وَمَنْ شَاءَ أَوْتَرَ بِوَاحِدَةٍ