Read Quran page 301 with Arabic text and Sahih International translation.
فَلَمَّا جَاوَزَا قَالَ لِفَتَىٰهُ ءَاتِنَا غَدَآءَنَا لَقَدْ لَقِينَا مِن سَفَرِنَا هَٰذَا نَصَبًۭا
So when they had passed beyond it, [Moses] said to his boy, "Bring us our morning meal. We have certainly suffered in this, our journey, [much] fatigue."
قَالَ أَرَءَيْتَ إِذْ أَوَيْنَآ إِلَى ٱلصَّخْرَةِ فَإِنِّى نَسِيتُ ٱلْحُوتَ وَمَآ أَنسَىٰنِيهُ إِلَّا ٱلشَّيْطَٰنُ أَنْ أَذْكُرَهُۥ ۚ وَٱتَّخَذَ سَبِيلَهُۥ فِى ٱلْبَحْرِ عَجَبًۭا
He said, "Did you see when we retired to the rock? Indeed, I forgot [there] the fish. And none made me forget it except Satan - that I should mention it. And it took its course into the sea amazingly".
قَالَ ذَٰلِكَ مَا كُنَّا نَبْغِ ۚ فَٱرْتَدَّا عَلَىٰٓ ءَاثَارِهِمَا قَصَصًۭا
[Moses] said, "That is what we were seeking." So they returned, following their footprints.
فَوَجَدَا عَبْدًۭا مِّنْ عِبَادِنَآ ءَاتَيْنَٰهُ رَحْمَةًۭ مِّنْ عِندِنَا وَعَلَّمْنَٰهُ مِن لَّدُنَّا عِلْمًۭا
And they found a servant from among Our servants to whom we had given mercy from us and had taught him from Us a [certain] knowledge.
قَالَ لَهُۥ مُوسَىٰ هَلْ أَتَّبِعُكَ عَلَىٰٓ أَن تُعَلِّمَنِ مِمَّا عُلِّمْتَ رُشْدًۭا
Moses said to him, "May I follow you on [the condition] that you teach me from what you have been taught of sound judgement?"
قَالَ إِنَّكَ لَن تَسْتَطِيعَ مَعِىَ صَبْرًۭا
He said, "Indeed, with me you will never be able to have patience.
وَكَيْفَ تَصْبِرُ عَلَىٰ مَا لَمْ تُحِطْ بِهِۦ خُبْرًۭا
And how can you have patience for what you do not encompass in knowledge?"
قَالَ سَتَجِدُنِىٓ إِن شَآءَ ٱللَّهُ صَابِرًۭا وَلَآ أَعْصِى لَكَ أَمْرًۭا
[Moses] said, "You will find me, if Allah wills, patient, and I will not disobey you in [any] order."
قَالَ فَإِنِ ٱتَّبَعْتَنِى فَلَا تَسْـَٔلْنِى عَن شَىْءٍ حَتَّىٰٓ أُحْدِثَ لَكَ مِنْهُ ذِكْرًۭا
He said, "Then if you follow me, do not ask me about anything until I make to you about it mention."
فَٱنطَلَقَا حَتَّىٰٓ إِذَا رَكِبَا فِى ٱلسَّفِينَةِ خَرَقَهَا ۖ قَالَ أَخَرَقْتَهَا لِتُغْرِقَ أَهْلَهَا لَقَدْ جِئْتَ شَيْـًٔا إِمْرًۭا
So they set out, until when they had embarked on the ship, al-Khidh r tore it open. [Moses] said, "Have you torn it open to drown its people? You have certainly done a grave thing."
قَالَ أَلَمْ أَقُلْ إِنَّكَ لَن تَسْتَطِيعَ مَعِىَ صَبْرًۭا
[Al-Khidh r] said, "Did I not say that with me you would never be able to have patience?"
قَالَ لَا تُؤَاخِذْنِى بِمَا نَسِيتُ وَلَا تُرْهِقْنِى مِنْ أَمْرِى عُسْرًۭا
[Moses] said, "Do not blame me for what I forgot and do not cover me in my matter with difficulty."
فَٱنطَلَقَا حَتَّىٰٓ إِذَا لَقِيَا غُلَٰمًۭا فَقَتَلَهُۥ قَالَ أَقَتَلْتَ نَفْسًۭا زَكِيَّةًۢ بِغَيْرِ نَفْسٍۢ لَّقَدْ جِئْتَ شَيْـًۭٔا نُّكْرًۭا
So they set out, until when they met a boy, al-Khidh r killed him. [Moses] said, "Have you killed a pure soul for other than [having killed] a soul? You have certainly done a deplorable thing."