Surah Al Kahf Tafseer

قَالُوا يَا ذَا الْقَرْنَيْنِ إِنَّ يَأْجُوجَ وَمَأْجُوجَ مُفْسِدُونَ فِي الاْاَرْضِ فَهَلْ نَجْعَلُ لَكَ خَرْجًا

They said:"O Dhul-Qarnayn! Verily, Ya'juj and Ma'juj are doing great mischief in the land. Shall we then pay you a tribute"

Ibn Jurayj reported from Ata' from Ibn Abbas that;

this meant a great reward, i.e., they wanted to collect money among themselves to give to him so that he would create a barrier between them and Ya'juj and Ma'juj.

عَلَى أَن تَجْعَلَ بَيْنَنَا وَبَيْنَهُمْ سَدًّا

in order that you might erect a barrier between us and them"

Dhul-Qarnayn said with kindness, righteousness and good intentions