Sunan Abi Dawud 1484
سنن أبي داود#1484SahihAbu Hurairah reported the Messenger of Allah (ﷺ) as saying:"One of you is granted an answer (to his supplication) provided he does not say: 'I prayed but I was not granted an answer
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 (6340) Sahih Muslim (2735)
In-book reference: 8:69