Abdullah bin al-Harith narrates: I heard Sayyiduna Ibn Abbas (may Allah be pleased with them both) say on the pulpit: "Al-Khidr was given this name because he sat on a patch of white land, and it stirred and turned lush green."
Sa'id bin Bashir said: Suwayd Abu Hatim told me that Qatadah used to narrate this hadith as marfu' (attributed to the Messenger of Allah (peace and blessings be upon him)).
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12858