It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that Abu al-Qasim (peace and blessings be upon him) said: "Al-Khidr was named 'Khidr' because he stood on a dry, barren patch of ground and it stirred with lush green growth."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Ikrimah (may Allah have mercy on him) except Bilal bin Mirdas (may Allah have mercy on him), and al-Hakam bin Zuhayr (may Allah have mercy on him) is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 5749
Hadith Takhrij«أخرجه البخاري فى «صحيحه» برقم: 3402، وابن حبان فى «صحيحه» برقم: 6222، والترمذي فى «جامعه» برقم: 3151، وأحمد فى «مسنده» برقم: 8228، 8344، والطيالسي فى «مسنده» برقم: 2671، والبزار فى «مسنده» برقم: 9393»