Surah Al-Kahf Verse 86 - English Translation by Aisha Bewley
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 he reached the setting of the sun and found it setting in a muddy spring and found a people by it. We said, ´Dhu´l-Qarnayn! You can either punish them or else you can treat them with gentleness.´