Quran 18:85 — The Cave (Al-Kahf)

Then, he pursued one way.

[18:84] We granted him authority on earth, and provided him with all kinds of means.

[18:86] When he reached the far west, he found the sun setting in a vast ocean, and found people there. We said, "O Zul-Qarnain, you can rule as you wish; either punish, or be kind to them."