Al-Hasan al-Basri narrates that Sayyiduna A'idh bin Amr (may Allah be pleased with him) went in to Ziyad and did not greet him with the title of governor, and he said: I heard the Messenger of Allah (peace and blessings be upon him) say: "The worst of rulers are those who crush their subjects." Beware lest you be one of them. Ziyad said to him: Sit down, for you are only from the chaff (the worthless ones) of the Companions of Muhammad (peace and blessings be upon him). A'idh (may Allah be pleased with him) said to him: Was there chaff among them? The chaff appeared only after them and among others (than them).
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15118