This verse speaks to the core theme of **Al-Kahf**.
Reflect on the meaning: "Until, when he reached the setting of the sun i.e., the west, he found it as if setting in a body of dark water, and he found near it a people. We i.e., Allāh said, "O Dhul-Qarnayn, either you punish them or else adopt among them a way of goodness."".