Bismillah Walhamdulillah Was Salaatu Was Salaam ‘ala Rasulillah
Narrated Abu Huraira (Radi-Allahu ‘anhu):
Allah’s Apostle (Sallallahu ‘Alaihi Wa Sallam) said, “The invocation of anyone of you is granted (by Allah) if he does not show impatience (by saying, "I invoked Allah but my request has not been granted.”)
Bukhari Vol. 8 : No. 352