Sunan Abi Dawud 1436
سنن أبي داود#1436SahihIbn 'Umar reported the Prophet (ﷺ) as saying:Make haste to observe the witr prayer before morning
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 ZaiIsnaad Sahih
In-book reference: 8:21