Surah Al-Kahf Verse 86 - English Translation by Muhammad Mahmoud Ghali
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 of the sun, (The western part of the then known world) he found it setting in a muddy spring, and he found a people at it. We said, "O Thulqarnayn, either you will torment (them) or you will take to yourself towards them a fair (way)