Surah 18. Al-Kahf, Ayah 95

It is generally assumed that the phrase "that wherein my Sustainer has so securely established me (makkanni)" refers to the power and wealth bestowed on him; but it is much more probable - and certainly more consistent with the ethical tenor of the whole parable of Dhu ‘l-Qarnayn - that it refers to God’s guidance rather than to worldly possessions.

Zul-qarnain was not greedy and did not want to impose a tribute to be carried away from an industrious population. He understood the power which Allah had given him, to involve duties and responsibilities on his part-the duty of protecting his subjects without imposing too heavy a taxation on them. He would provide the motive force and organising skill. Would they obey him and provide the material and labour, so that they could close the gap with a strong barrier, probably with well-secured gates? The word radm, translated "Barrier," does not necessarily mean a wall, but rather suggests a blocked door or entrance.