Sayyiduna al-Miqdam bin Ma'di Karib and Sayyiduna Abu Umamah (may Allah be pleased with them both) said that the Messenger of Allah (peace and blessings be upon him) said: "When the ruler seeks out suspicion (and faults) among the people, he corrupts them."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17785