Jubayr bin Nufayr (may Allah have mercy on him) says that Sayyiduna Iyad bin Ghanm al-Ash'ari (may Allah be pleased with him) fell upon (punished) the master of Dara when it was conquered. Then Hisham bin Hakim (may Allah be pleased with him) came and said very harsh things to him. After a few nights Hisham (may Allah be pleased with him) came to apologise to him, and said to Iyad (may Allah be pleased with him): Do you not know that the Prophet (peace and blessings be upon him) said: "On the Day of Resurrection the most severe punishment will be for the one who used to punish people most severely in the world"? Iyad (may Allah be pleased with him) said: O Hisham! The one from whom you heard, those whom you saw, and those with whom you stayed, we too have met them; we have heard and we have kept company. O Hisham! Have you not heard this saying of the Prophet (peace and blessings be upon him): "Whoever has some advice for a ruler should not say it in front of everyone; let him take him by the hand and go aside with him in private. If the ruler accepts it, well and good; and if he does not, then he has fulfilled his duty"? O Hisham! You are very bold, you have dared (to speak) against the ruler appointed by Allah. Do you not fear that Allah's ruler might kill you, so that you would be slain at the hands of Allah's ruler?
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قتال أهل البغي / 16660