Jami` at-Tirmidhi 3151
جامع الترمذي#3151SahihNarrated Abu Hurairah: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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih Bukhari
In-book reference: 47:203