Sunan Abi Dawud 1505
سنن أبي داود#1505SahihAl-Mughirah b. Shu'bah reported:"Mu'awiyah wrote to al-Mughirah b. Shu'bah: 'What would the the Messenger of Allah (ﷺ) recite when he gave Taslim (salutation) in the prayer ?' Al-Mughirah dictated and wrote to Mu'awiyah: 'The Messenger of Allah (ﷺ) used to say (at the end of the prayer after taslim): 'There is no God but Allah, Alone, Who has no partner, to Him belongs the dominion, to Him praise is due, and He is Omnipotent. O Allah no one cane withhold what You give and give what You withhold, and none benefits the fortunate person, for from You is the fortune
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 Bukhari (844) Sahih Muslim (593)
In-book reference: 8:90