Sahih Muslim Book - 48, Hadith - 6936

حَدَّثَنِى أَبُو الطَّاهِرِ أَخْبَرَنَا ابْنُ وَهْبٍ أَخْبَرَنِى مُعَاوِيَةُ - وَهُوَ ابْنُ صَالِحٍ - عَنْ رَبِيعَةَ بْنِ يَزِيدَ عَنْ أَبِى إِدْرِيسَ الْخَوْلاَنِىِّ عَنْ أَبِى هُرَيْرَةَ عَنِ النَّبِىِّ -صلى الله عليه وسلم- أَنَّهُ قَالَ « لَا يَزَالُ يُسْتَجَابُ لِلْعَبْدِ مَا لَمْ يَدْعُ بِإِثْمٍ أَوْ قَطِيعَةِ رَحِمٍ مَا لَمْ يَسْتَعْجِلْ ». قِيلَ يَا رَسُولَ اللَّهِ مَا الاِسْتِعْجَالُ قَالَ « يَقُولُ قَدْ دَعَوْتُ وَقَدْ دَعَوْتُ فَلَمْ أَرَ يَسْتَجِيبُ لِى فَيَسْتَحْسِرُ عِنْدَ ذَلِكَ وَيَدَعُ الدُّعَاءَ ».

It was narrated from Abu Hurairah that the Prophet (s.a.w) said: "A person will still be answered so long as his supplication does not involve sin or severing ties of kinship, and so long as he does not become impatient." It was said: "O Messenger of Allah, what does being impatient mean?" He said: "Saying: 'I supplicated, and I supplicated, and I did not receive any response,' then he becomes disappointed and stops supplicating."