18:66
قَالَ لَهُۥ مُوسَىٰ هَلْ أَتَّبِعُكَ عَلَىٰٓ أَن تُعَلِّمَنِ مِمَّا عُلِّمْتَ رُشْدًا
qāla lahu mūsā hal attabiʿuka ʿalā an tuʿallimani mimmā ʿullim'ta rush'dan
Moses said to him, "May I follow you on [the condition] that you teach me from what you have been taught of sound judgement?"
— Saheeh International
Moses said to him, ‘May I follow you so that you can teach me some of the right guidance you have been taught?’
— M. A. S. Abdel Haleem
Mûsâ (Moses) said to him (Khidr): "May I follow you so that you teach me something of that knowledge (guidance and true path) which you have been taught (by Allâh)?"
— Muhammad Muhsin Khan & Muhammad Taqi-ud-Din al-Hilali