Hadith 5604
He reported God's messenger as saying, "The inhabitants of hell will be drawn up in line, and when one of the inhabitants of paradise passes them one of them will say, `So and so, do you not recognise me? I am the one who gave you a drink.' And one of them will say, `I am the one who gave you water for ablution.' He will then intercede for him and bring him into paradise." Ibn Majah transmitted it.
وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: " يُصَفُّ أَهْلَ النَّارِ فَيَمُرُّ بِهِمُ الرَّجُلُ مِنْ أَهْلِ الْجَنَّةِ فَيَقُولُ الرَّجُلُ مِنْهُمْ: يَا فُلَانُ أَمَا تَعْرِفُنِي؟ أَنَا الَّذِي سَقَيْتُكَ شَرْبَةً. وَقَالَ بَعْضُهُمْ: أَنَا الَّذِي وَهَبْتُ لَكَ وَضُوءًا فَيَشْفَعُ لَهُ فَيُدْخِلُهُ الْجَنَّةَ ". رَوَاهُ ابْنُ مَاجَه