Tafseer Ibn Kathir of AL KAHFI [65]

فَوَجَدَا عَبْدًا مِّنْ عِبَادِنَا آتَيْنَاهُ رَحْمَةً مِنْ عِندِنَا وَعَلَّمْنَاهُ مِن لَّدُنَّا 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 [certain] knowledge.