Jami` at-Tirmidhi 3412
جامع الترمذي#3412SahihKa’b bin Ujrah narrated that:The Prophet said: “There are Mu’aqqibat, he who says them shall not be miserable. Glorify Allah at the end of every prayer thirty-three times, and praise him thirty-three times, and extol His greatness thirty-four times.”
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih Muslim
In-book reference: 48:43