Abu Dawud said: Some of it from Ibn Bashshar was unclear to me.

1356 — ‘Uthman ibn Abi Shaybah narrated to us, Waki‘ narrated to us, Muhammad ibn Qays al-Asadi narrated to us, from al-Hakam ibn ‘Utaybah, from Sa‘id ibn Jubayr, from Ibn ‘Abbas, who said: I spent the night at my maternal aunt Maymunah’s house. The Messenger of Allah (peace and blessings be upon him) came after evening had fallen and said: "Did the boy pray?" They said: Yes. Then he lay down, and when as much of the night had passed as Allah willed, he got up, performed ablution, and then prayed seven or five rak‘ahs, making them odd (witr), not saying the taslim except at the end of them.

1357 — Ibn al-Muthanna narrated to us, Ibn Abi ‘Adi narrated to us, from Shu‘bah, from al-Hakam, from Sa‘id ibn Jubayr —

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And it was also recorded by Muhammad ibn Nasr al-Marwazi in "Kitab al-Witr" (32), and al-Tabarani 18/ (761) via the route of Zuhayr ibn Muhammad, and al-Tabarani 18/ (862) via the route of Sulayman ibn Bilal, both of them from him, from Kurayb, from al-Fadl.
And it was recorded by al-Bukhari (4569) and (7452), and Muslim (763) via the route of Muhammad ibn Ja‘far, from Sharik, from Kurayb, from ‘Abdullah ibn ‘Abbas. And thus it was narrated by more than one from Kurayb, as will come at no. 1364.
And see what will come at no. 1365.
And see what preceded at no. 1353.

(1) Its chain of transmission is sound. Waki‘: he is Ibn al-Jarrah.
And it was recorded by Muhammad ibn Nasr al-Marwazi in "al-Witr" (38) via the route of Muhammad ibn Qays, with this chain.
And his statement "not saying the taslim except at the end of them" is corroborated by the two hadiths of ‘A’ishah that preceded at nos. 1338 and 1342, and their chains of transmission are both sound.
And see the two that follow.