Hadith
حَدَّثَنَا مُسْلِمُ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا هِشَامٌ الدَّسْتَوَائِيُّ، عَنْ يَحْيَى، عَنْ أَبِي جَعْفَرٍ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ " ثَلاَثُ دَعَوَاتٍ مُسْتَجَابَاتٌ لاَ شَكَّ فِيهِنَّ دَعْوَةُ الْوَالِدِ وَدَعْوَةُ الْمُسَافِرِ وَدَعْوَةُ الْمَظْلُومِ " .
Narrated AbuHurayrah: The Prophet (ﷺ) said: Three supplications are answered, there being no doubt about them; that of a father, that of a traveller and that of one who has been wronged
Hasan · Al-Albani
Sunan Abi Dawud 1536 ·Book 8, Hadith 121·Also available on sunnah.com·