عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ: ((إِنَّ اللَّهَ عَزَّ وَجَلَّ لَيَرْفَعُ الدَّرَجَةَ لِلْعَبْدِ الصَّالِحِ فِي الْجَنَّةِ، فَيَقُولُ: يَا رَبِّ أَنَّى لِي هَذِهِ؟ فَيَقُولُ: بِاسْتِغْفَارِ وَلَدِكَ لَكَ))
It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: When Allah Almighty elevates the rank of a righteous servant in Paradise, he will ask: O my Lord! How did I attain this rank? Allah Almighty will say: Because of your son's supplication for your forgiveness.