Sunan Abi Dawud 1362
سنن أبي داود#1362SahihAbd Allah b. Abi Qais said that he asked 'Aishah:How many rak'ahs would the Messenger of Allah (ﷺ) pray observing the witr ? She said: He used to observe the witr with four and three, six and three, eight and three, and ten and three rak'ahs never observing less than seven or more than thirteen. The narrator Ahmad added in his version: He would not observe the witr with two rak'ahs before the dawn. I asked: With what would he observe the witr ? She said: He would never leave it. The version of Ahmad does not mention the words "six and three (rak'ahs)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih
In-book reference: 5:113