Surah Al-Kahf Verse 86 - English Translation by Ali Unal
Surah Al-Kahfحَتَّىٰٓ إِذَا بَلَغَ مَغۡرِبَ ٱلشَّمۡسِ وَجَدَهَا تَغۡرُبُ فِي عَيۡنٍ حَمِئَةٖ وَوَجَدَ عِندَهَا قَوۡمٗاۖ قُلۡنَا يَٰذَا ٱلۡقَرۡنَيۡنِ إِمَّآ أَن تُعَذِّبَ وَإِمَّآ أَن تَتَّخِذَ فِيهِمۡ حُسۡنٗا
Until, when he reached the setting-place of the sun, he saw it setting in a spring of hot and black muddy water, and nearby he found a people. We said: "O Dhu’l-Qarnayn! You can either punish them or you can treat them with kindness. (Which way will you choose)