Narrated Kharijah bin Hudhaifah (RA):

Allah's Messenger (ﷺ) said: "Allah the Exalted has given you an extra prayer which is better for you than the red camels (high breed camels)." We asked, "What is it O Allah's Messenger (ﷺ) ." He said, "The Witr between the 'Isha' prayer and up till the break of dawn." [Reported by al-Khamsah except an-Nasa'i and al-Hakim graded it Sahih (authentic)].

وَعَنْ خَارِجَةَ بْنِ حُذَافَةَ ‏- رضى الله عنه ‏- قَالَ : قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ إِنَّ اَللَّهَ أَمَدَّكُمْ بِصَلَاةٍ هِيَ خَيْرٌ لَكُمْ مِنْ حُمُرِ اَلنَّعَمِ

قُلْنَا : وَمَا هِيَ يَا رَسُولَ اَللَّهِ ? قَالَ :

اَلْوِتْرُ , مَا بَيْنَ صَلَاةِ اَلْعِشَاءِ إِلَى طُلُوعِ اَلْفَجْرِ } رَوَاهُ اَلْخَمْسَةُ إِلَّا النَّسَائِيَّ وَصَحَّحَهُ اَلْحَاكِمُ .‏ [1]‏