Abu Dawud said: The narrator Hilal is a client of 'Umar b. 'Abd al-Aziz. The name of Ja'far, a narrator, is 'Abd Allah b. Ja'far.
In-book : Book 8, Hadith 110
English translation : Book 8, Hadith 1520
8. Prayer (Kitab Al-Salat): Detailed Injunctions about Witr
باب فِي الاِسْتِغْفَارِ