Narrated ['Aishah (RA)]:

Allah's Messenger (ﷺ) used to pray thirteen Rak'at during the night, offering a Witr out of that with five and sitting only during the last of them. [Agreed upon].

وَعَنْهَا قَالَتْ: { كَانَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-يُصَلِّي مِنْ اَللَّيْلِ ثَلَاثَ عَشْرَةَ رَكْعَةً, يُوتِرُ مِنْ ذَلِكَ بِخَمْسٍ, لَا يَجْلِسُ فِي شَيْءٍ إِلَّا فِي آخِرِهَا.‏ } [1]‏ .‏