Sunan Abi Dawud 1295
سنن أبي داود#1295SahihNarrated Abdullah ibn Umar: The Prophet (ﷺ) said: Prayer by night and day should consist of pairs of 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 ZaiHasan
In-book reference: 5:46