It is narrated from Sayyiduna Kharijah bin Hudhafah (may Allah be pleased with him); he said: The Messenger of Allah (peace and blessings be upon him) came out to us and said: "Allah, the Mighty and Majestic, has granted you a prayer that is better for you than red camels; it has been given to you in the time between the Isha prayer and the rising of dawn (Fajr)."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 4121