(Al-Kahf) 18 : 95
قَالَ مَا مَكَّنِّي فِيهِ رَبِّي خَيْرٌ فَأَعِينُونِي بِقُوَّةٍ أَجْعَلْ بَيْنَكُمْ وَبَيْنَهُمْ رَدْمًا
He said: "Whatever my Lord bestowed upon me is the Better, then you assist me with manpower; I will make between you and them a wall”.
Dul-Qarnayn didn't receive any financial support from the people. He was satisfied with what Lord has already bestowed upon him. That would be the character of believers who testifies Adhikr. But the character of others is that they will not avoid any chance they get to exploit the people.