Narrated Kharijah ibn Hudhafah al-Adawi: The Apostle of Allah peace be upon him came out to us and said: Allah the Exalted has given you an extra prayer which is better for you then the red camels (i.e. high value camels). This is the witr which Allah has appointed for you between the night prayer and the daybreak. (Bukhari Book #8, Hadith #1413)