Sunnah.com reference : Book 1, Hadith 6English translation : Book 27, Hadith 481Arabic reference : Book 1, Hadith 481
Abu Hurayra reported that the Prophet, may Allah bless him and
grant him peace, said, "There are three supplications which are answered:
the supplication of the person who is wronged, the supplication of the
traveller, and the supplication of a parent for his child.
حَدَّثَنَا أَبُو نُعَيْمٍ، قَالَ‏:‏ حَدَّثَنَا شَيْبَانُ، عَنْ يَحْيَى، عَنْ أَبِي جَعْفَرٍ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ‏:‏ ثَلاَثُ دَعَوَاتٍ مُسْتَجَابَاتٍ‏:‏ دَعْوَةُ الْمَظْلُومِ، وَدَعْوَةُ الْمُسَافِرِ، وَدَعْوَةُ الْوَالِدِ عَلَى وَلَدِهِ‏.‏