Sayyiduna Amir bin Wathilah al-Laythi (may Allah be pleased with him) says that a man of the people of Tayma', who was one of the People of the Book, came to Abd al-Malik bin Marwan and said: O Commander of the Believers! Ibn Hurmuz has wronged me and transgressed against me. Abd al-Malik ignored him. Then he complained again, and again he ignored him. So he said again, in anger: O Commander of the Believers! It is written in the Torah, which Allah Almighty revealed to Musa (peace be upon him), that the injustice and transgression of a governor is no sin upon the ruler as long as the ruler remains unaware of it; but once he comes to know, he is a sinner. When Abd al-Malik heard this, he removed Ibn Hurmuz from his post.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قتال أهل البغي / 16654