So they set out, until when they met a boy, he [i.e., al-Khiḍr] killed him. [Moses] said, "Have you killed a pure soul for other than [having killed] a soul? You have certainly done a deplorable thing."
Verse 74 of Surah Al-Kahf (18:74), a Meccan surah, is in juz 15, on page 301 of the mushaf. Read it in Arabic with its transliteration, translations and tafsir, and listen to it recited by 73 reciters.
Listen to verse 74 of Surah Al-Kahf
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Tafsir of verse 74
Al-Mukhtasar
After they disembarked from the ship they set out walking along the seashore, when they saw a young boy who was still not an adult playing with the other boys. Khidr killed him and Moses said to him: Did you kill a pure soul that is still a minor for no sin? You have really done something evil!!
Then they proceeded until they met a boy, and the man killed him. Moses said, “Did you kill an innocent soul who killed none? You have done something monstrous!”
Then they both proceeded, till they met a boy, and he (Khidr) killed him. Mûsâ (Moses) said: "Have you killed an innocent person who had killed none? Verily, you have committed a thing Nukr (a great Munkar - prohibited, evil, dreadful thing)!"
So they twain journeyed on till, when they met a lad, he slew him. (Moses) said: What! Hast thou slain an innocent soul who hath slain no man? Verily thou hast done a horrid thing.
Then they proceeded: until, when they met a young man, he slew him. Moses said: "Hast thou slain an innocent person who had slain none? Truly a foul (unheard of) thing hast thou done!"
So they went on until, when they met a boy, he slew him. (Musa) said: Have you slain an innocent person otherwise than for manslaughter? Certainly you have done an evil thing.
So they (both) went off until, when they (both) met a youth, then he killed him. He said, "Have you killed a most cleansed self without (his having killed another) self? Indeed you have already come with a (highly) maleficent thing."