Nizam-Ul-Mulk and the problem of regularity and social Justice

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In order to ensure social justice, the Just king must be aware of
the people's situation, not to be distracted, constantly know and walk
about their affairs and deeds, so that they just do not oppress them.
"Those who give something to Ummal (zakat collectors)," he writes,
"live well with the people and treat them well and show them the way
not to demand taxes other than khiroj.