(17) باب الأَمْرِ وَالنَّهْىِ
Narrated AbuSa'id al-Khudri:
The Prophet (ﷺ) said: The best fighting (jihad) in the path of Allah is (to speak) a word of justice to an oppressive ruler. (ES)
Reference (ES): Sunan Abi Dawud 4344 (ES)
In-book reference (ES): Book 39, Hadith 54 (ES)
English translation (ES): Book 38, Hadith 4330 (ES)