Musannaf Ibn Abi Shayba 3:4480

Abu Bakr narrated to us, he said: Yazid bin Harun narrated to us, from Muhammad bin Ishaq, from Yazid bin Abi Habib, from Abdullah bin Rashid al-Zurqi, from Kharijah bin Hudhafah al-Adawi, who said: The Messenger of Allah (may Allah bless him and grant him peace) came out to us for the morning prayer and said: "Allah has aided you tonight with a prayer that is better for you than red camels." We said: "And what is it, O Messenger of Allah?" He said: "The Witr, between the Isha prayer and the break of dawn."