It is said that one of the later Caliphs was performing Tawaaf when a scholar reproached him harshly. The Caliph (Khalifa) protested, “Look! Neither am I worse than Fir` awn nor are you better than Musa (as). Allah (the Almighty and Exalted) said, ‘speak to him mildly.’”
Commentary taken from Tafsir Ishraq al-Ma’ani by Sayyid Iqbal Zaheer. Translation taken (with slight alterations) from Khan and Hilali’s Noble Qur’an.