Nahj al-Balāgha
Hadith 1523ثُمَّ إِنَّ لِلْوَالِي خَاصَّةً وبِطَانَةً، فِيهِمُ اسْتِئْثَارٌ وَتَطَاوُلٌ، وَقِلَّةُ إِنْصَافٍ فِي مُعَامَلَةٍ، فَاحْسِمْ مَادَّةَ أُولَئِكَ بِقَطْعِ أَسْبَابِ تِلْكَ الْأَحْوَالِ،
Further, a governor has favourites and people of easy access to him. They misappropriate things, are high-handed and do not observe justice in matters. You should destroy the root of evil in the people by cutting away the causes of these defects.