Sunan Ibn Majah, Volume 5, Book 34, Hadith 3862 (DarusSalam) ⓘ

It was narrated that Abu Hurairah that : the Messenger of Allah (saas) said: "There are three supplications that will undoubtedly be answered: the supplication of one who has been wronged; the supplication of the traveler; and the supplication of a father for his child."

حَدَّثَنَا أَبُو بَكْرٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ بَكْرٍ السَّهْمِيُّ، عَنْ هِشَامٍ الدَّسْتَوَائِيِّ، عَنْ يَحْيَى بْنِ أَبِي كَثِيرٍ، عَنْ أَبِي جَعْفَرٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ ‏ "‏ ثَلاَثُ دَعَوَاتٍ يُسْتَجَابُ لَهُنَّ لاَ شَكَّ فِيهِنَّ دَعْوَةُ الْمَظْلُومِ وَدَعْوَةُ الْمُسَافِرِ وَدَعْوَةُ الْوَالِدِ لِوَلَدِهِ ‏" ‏ ‏.‏