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."
Jami` at-Tirmidhi Book 47, Hadith 203
← Previous Hadith 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.'"

Jami` at-Tirmidhi Book 47, Hadith 202 Next Hadith → that regarding Allah's saying: And there was under it a treasure belonging to them (18:82) - the Prophet (ﷺ) said: "Gold and silver."

Jami` at-Tirmidhi Book 47, Hadith 204