Narrated ['Aishah (RA)]:

Allah's Messenger (ﷺ) offered Witr prayer (on different nights) at various hours, extending (from the 'Isha' prayer) up to the last hour of the night. [Agreed upon].

وَعَنْهَا قَالَتْ: { مِنْ كُلِّ اَللَّيْلِ قَدْ أَوْتَرَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-فَانْتَهَى وِتْرُهُ إِلَى اَلسَّحَرِ } مُتَّفَقٌ عَلَيْهِمَا .‏ [1]‏ .‏