18:86
حَتّٰ٘ي اِذَا بَلَغَ مَغۡرِبَ الشَّمۡسِ وَجَدَهَا تَغۡرُبُ فِيۡ عَيۡنٍ حَمِئَةٍ وَّوَجَدَ عِنۡدَهَا قَوۡمًا ؕ قُلۡنَا يٰذَا الۡقَرۡنَيۡنِ اِمَّا٘ اَنۡ تُعَذِّبَ وَاِمَّا٘ اَنۡ تَتَّخِذَ فِيۡهِمۡ حُسۡنًا
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