Sahih Al Bukhari (74)

حَدَّثَنِي مُحَمَّدُ بْنُ غُرَيْرٍ الزُّهْرِيُّ، قَالَ: حَدَّثَنَا يَعْقُوبُ بْنُ إِبْرَاهِيمَ، قَالَ: حَدَّثَنِي أَبِي، عَنْ صَالِحٍ، عَنِ ابْنِ شِهَابٍ، حَدَّثَهُ أَنَّ عُبَيْدَ اللَّهِ بْنَ عَبْدِ اللَّهِ أَخْبَرَهُ عَنِ ابْنِ عَبَّاسٍ أَنَّهُ تَمَارَى هُوَ وَالحُرُّ بْنُ قَيْسِ بْنِ حِصْنٍ الفَزَارِيُّ فِي صَاحِبِ مُوسَى، قَالَ ابْنُ عَبَّاسٍ: هُوَ خَضِرٌ، فَمَرَّ بِهِمَا أُبَيُّ بْنُ كَعْبٍ، فَدَعَاهُ ابْنُ عَبَّاسٍ فَقَالَ: إِنِّي تَمَارَيْتُ أَنَا وَصَاحِبِي هَذَا فِي صَاحِبِ مُوسَى، الَّذِي سَأَلَ مُوسَى السَّبِيلَ إِلَى لُقِيِّهِ، هَلْ سَمِعْتَ النَّبِيَّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ يَذْكُرُ شَأْنَهُ؟ قَالَ: نَعَمْ، سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ يَقُولُ: " بَيْنَمَا مُوسَى فِي مَلَإٍ مِنْ بَنِي إِسْرَائِيلَ جَاءَهُ رَجُلٌ فَقَالَ: هَلْ تَعْلَمُ أَحَدًا أَعْلَمَ مِنْكَ؟ " قَالَ مُوسَى: لاَ، فَأَوْحَى اللَّهُ عَزَّ وَجَلَّ إِلَى مُوسَى: بَلَى، عَبْدُنَا خَضِرٌ، فَسَأَلَ مُوسَى السَّبِيلَ إِلَيْهِ، فَجَعَلَ اللَّهُ لَهُ الحُوتَ آيَةً، وَقِيلَ لَهُ: إِذَا فَقَدْتَ الحُوتَ فَارْجِعْ، فَإِنَّكَ سَتَلْقَاهُ، وَكَانَ يَتَّبِعُ أَثَرَ الحُوتِ فِي البَحْرِ، فَقَالَ لِمُوسَى فَتَاهُ: (أَرَأَيْتَ إِذْ أَوَيْنَا إِلَى الصَّخْرَةِ فَإِنِّي نَسِيتُ الحُوتَ وَمَا أَنْسَانِيهِ إِلَّا الشَّيْطَانُ أَنْ أَذْكُرَهُ)، قَالَ: (ذَلِكَ مَا كُنَّا نَبْغِي فَارْتَدَّا عَلَى آثَارِهِمَا قَصَصًا)، فَوَجَدَا خَضِرًا، فَكَانَ مِنْ شَأْنِهِمَا الَّذِي قَصَّ اللَّهُ عَزَّ وَجَلَّ فِي كِتَابِهِ "

Ibn `Abbas (may Allah be pleased with him) narrate that he differed with Al Hur ibn Qays Al Fazary regarding the companion of Moses. Ibn `Abbas said that he was Al Khadir. Meanwhile Ubay ibn Ka`b passed by them and Ibn `Abbas called him saying: "My friend and I have differed regarding Moses' companion whom Moses asked the way to meet. Have you heard Allah's Messenger (peace be upon him) mentioning something about him?" He said: "Yes, I heard Allah's Messenger (peace be upon him) saying: 'While Moses was sitting in the company of some Israelites, a man came and asked (him), 'Do you know anyone who is more learned than you?' Moses replied: 'No.' So, Allah sent the Divine Inspiration to Moses: 'Yes, Our Servant, Al Khadir (is more learned than you).' Moses asked how to meet him (i.e. Al Khadir). So, the fish, was made, as a sign for him, and he was told that when the fish was lost, he should return and there he would meet him. So, Moses went on looking for the sign of the fish in the sea. The servant boy of Moses said to him: 'Do you know that when we were sitting by the side of the rock, I forgot the fish, and it was only Satan who made me forget to tell (you) about it.' Moses said: That was what we were seeking after,' and both of them returned, following their footmarks and found Al Khadir; and what happened further to them, is mentioned in Allah's Book."