Al Kahf, 86 Ayah
18:86
حَتَّىٰٓ إِذَا بَلَغَ مَغۡرِبَ ٱلشَّمۡسِ وَجَدَهَا تَغۡرُبُ فِي عَيۡنٍ حَمِئَةٖ وَوَجَدَ عِندَهَا قَوۡمٗاۖ قُلۡنَا يَٰذَا ٱلۡقَرۡنَيۡنِ إِمَّآ أَن تُعَذِّبَ وَإِمَّآ أَن تَتَّخِذَ فِيهِمۡ حُسۡنٗا ٨٦
Ĥattá 'Idhā Balagha Maghriba Ash-Shamsi Wajadahā Taghrubu Fī `Aynin Ĥami'atin Wa Wajada `Indahā Qawmāan ۗ Qulnā Yā Dhā Al-Qarnayni 'Immā 'An Tu`adhdhiba Wa 'Immā 'An Tattakhidha Fīhim Ĥusnāan
Until, when he reached the setting of the sun, he found it [as if] setting in a spring of dark mud, and he found near it a people. Allah said, "O Dhul-Qarnayn, either you punish [them] or else adopt among them [a way of] goodness."