Sunan Abu Dawud
1426
Sahih+3

The aforesaid tradition has been transmitted by Abu Ishaq with the same chain and to the same effect. In the last of this tradition he said:The version has the words: "He would recite the supplication of the witr." He did not mention the words: "I say them in the witr." Abu Dawud said: The name of Abu al-Hawra' is Rabi'ah b. Shaiban

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid