حَتّٰىٓ اِذَا بَلَغَ مَغْرِبَ الشَّمْسِ وَجَدَهَا تَغْرُبُ فِيْ عَيْنٍ حَمِئَةٍ وَّوَجَدَ عِنْدَهَا قَوْمًا ەۗ قُلْنَا يٰذَا الْقَرْنَيْنِ اِمَّآ اَنْ تُعَذِّبَ وَاِمَّآ اَنْ تَتَّخِذَ فِيْهِمْ حُسْنًا ( الكهف: ٨٦ )
Hattaaa izaa balagha maghribash shamsi wajadahaaa taghrubu fee 'aynin hami'a tinw wa wajada 'indahaa qawmaa; qulnaa yaa Zal Qarnaini immaaa an tu'az ziba wa immaaa an tattakhiza feehim husnaa (al-Kahf 18:86)
Sahih International:
Until, when he reached the setting of the sun [i.e., the west], he found it [as if] setting in a body of dark water, and he found near it a people. We [i.e., Allah] said, "O Dhul-Qarnayn, either you punish [them] or else adopt among them [a way of] goodness." (Al-Kahf [18] : 86)
1 Mufti Taqi Usmani
until when he reached the point of sunset, he found it setting into a miry spring, and found a people near it. We said, “O Dhul-Qarnain, either punish them or adopt good behavior with them.”