Concise Quran Commentary
And he travelled on earth until he reached the end of the land towards the setting place of the sun, seeing it as though it was setting in a hot spring of black clay. And he found an unbelieving people by the setting place of the sun. So I said to him, to test him: “O Dhu’l-Qarnayn, you can either punish these people by killing them or through other means, or you can be good to them”.