Tafsir of Al-Kahf 18:70

"So do not ask me" (fala tas'alni): It is read with the emphatic nun (doubled). It means: The condition for your following me is that if you see me do something—even if you know it is correct, but its correctness remains hidden from you—you must restrain yourself and deny the urge within you to initiate questioning or debate with me about it, until I am the one to explain it to you. This is among the etiquettes of the student toward the scholar, and the follower toward the one being followed.

"Then they both set out, until when they had boarded the ship, he scuttled it. [Moses] said, 'Have you scuttled it to drown its people? You have surely done a grave thing.' He said, 'Did I not say that you would never be able to bear with me patiently?'"