(23) باب الدُّعَاءِ
Abu 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.'"
Reference: Sunan Abi Dawud 1484
In-book reference: Book 8, Hadith 69
English translation: Book 8, Hadith 1479