Sunan Abi Dawud 1431
سنن أبي داود#1431SahihNarrated AbuSa'id al-Khudri: The Prophet (ﷺ) said: If anyone oversleeps and misses the witr, or forgets it, he should pray when he remembers
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
Zubair Ali ZaiIsnaad Sahih
In-book reference: 8:16