Sunan Abi Dawud 1434
سنن أبي داود#1434SahihNarrated AbuQatadah: The Prophet (ﷺ) asked AbuBakr: When do you observe the witr? He replied: I observe the witr prayer in the early hours of the night. The Prophet (ﷺ) asked Umar: When do you observe the witr? He replied: At the end of the night. He then said to AbuBakr: This has followed it with care; and he said to Umar: He has followed it with strength
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 ArnautHasan
Zubair Ali ZaiHasan
In-book reference: 8:19