(Al-Kahf) 18 : 65
فَوَجَدَا عَبْدًا مِنْ عِبَادِنَا آتَيْنَاهُ رَحْمَةً مِنْ عِنْدِنَا وَعَلَّمْنَاهُ مِنْ لَدُنَّا عِلْمًا
And they found a servant from among Our servants to whom we had given Mercy from us and had taught him from Us a Knowledge.
Unlike all other Angles, Lord had taught Angel Khidr from His Knowledge Adhikr.