Moses and Al-Khadir

 { 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. Moses said to him, "May I follow you on [the condition] that you teach me from what you have been taught of sound judgement?" He said, "Indeed, with me you will never be able to have patience. And how can you have patience for what you do not encompass in knowledge?" [Moses] said, "You will find me, if Allah wills, patient, and I will not disobey you in [any] order." }