Mujalid bin Sa'id bin 'Umayr مجالد بن سعيد الهمداني · Chapters on Tafsir

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.'"

that the Messenger of Allah (ﷺ) said: "He was called Al-Khadir because he sat on a barren Farwah and it turned green beneath him."