Narrated Ibn 'Abbas:
that Ubayy bin Ka'b narrated that the Prophet (ﷺ) said: "The boy that Al-Khidr killed was destined to be a disbeliever the day he was created.'" (RU)
English reference (RU): Vol. 5, Book 44, Hadith 3150 (RU)
Arabic reference (RU): Book 47, Hadith 3443 (RU)