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."  

قَالَ رَسُولُ اللَّهِ ﷺ ثَلاَثُ دَعَوَاتٍ يُسْتَجَابُ لَهُنَّ لاَ شَكَّ فِيهِنَّ دَعْوَةُ الْمَظْلُومِ وَدَعْوَةُ الْمُسَافِرِ وَدَعْوَةُ الْوَالِدِ لِوَلَدِهِ  

"I heard the Messenger of Allah (saas) say: 'The supplication of a father reaches the Veil (i.e. the place of repentance).'"  

حَدَّثَنَا أَبُو سَلَمَةَ حَدَّثَتْنَا حَبَابَةُ ابْنَةُ عَجْلاَنَ عَنْ أُمِّهَا أُمِّ حَفْصٍ عَنْ صَفِيَّةَ بِنْتِ جَرِيرٍ عَنْ أُمِّ حَكِيمٍ بِنْتِ وَدَاعٍ الْخُزَاعِيَّةِ قَالَتْ سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ دُعَاءُ الْوَالِدِ يُفْضِي إِلَى الْحِجَابِ