Yahya related to me from Malik from Ibn Shihab from Abu Ubayd, the mawla of Ibn Azhar, from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, "You will be answered as long as you are not impatient and say, 'I have made a dua and I have not been answered .' "


وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ أَبِي عُبَيْدٍ، مَوْلَى ابْنِ أَزْهَرَ عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ يُسْتَجَابُ لأَحَدِكُمْ مَا لَمْ يَعْجَلْ فَيَقُولُ قَدْ دَعَوْتُ فَلَمْ يُسْتَجَبْ لِي ‏"‏ ‏.‏
USC-MSA web (English) reference : Book 15, Hadith 29
Arabic reference : Book 15, Hadith 501