“The Messenger of Allah ﷺ used to pray Witr with seven or five Rak’ah, and he would not say Salam or speak in between them.” (Using translation from Ibn Mājah 1192)
كَانَ رَسُولُ اللهِ ﷺ «يُوتِرُ بِسَبْعٍ وَخَمْسٍ لَا يَفْصِلُ بَيْنَهُنَّ بِتَسْلِيمٍ وَلَا بِكَلَامٍ»