وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «أَفْضَلُ الْجِهَادِ مَنْ قَالَ كَلِمَةَ حَقٍّ عِنْدَ سُلْطَانٍ جَائِرٍ»
He reported God’s Messenger as saying, “The most excellent jihad is when one speaks a true word in the presence of a tyrannical ruler.” Tirmidhi, Abu Dawud and Ibn Majah transmitted it, and Ahmad and Nasai transmitted it on the authority of Tariq ibn Shihab.
Mishkat al-Masabih 3550, Book 19, The Offices of Commander and Qadi, Hadith 45. 1 min read