Tafsir of Al-Kahf 18:91

So (it was)! And We knew all about him. Mujahid and As-Suddi said, "This means that Allah knew everything about him and his army, and nothing was hidden from Him, even though they came from so many different nations and lands. For,

ﻻ يخفى عليه شء في اﻻرض وﻻ فى السماء

Truly, nothing is hidden from Allah, in the earth or in the heaven. (3:5)''