Riyad U Saliheen, Hadith # 194

Abu Sa`id Al-Khudri (May Allah bepleased with him) reported: The Prophet (PBUH) said, "The best type of Jihad (striving in the way of Allah) is speaking a true word in the presence of a tyrant ruler.''
[Abu Dawud and At-Tirmidhi].

Commentary: Jihad has many degrees. Preaching of virtue is also Jihad. The most meritorious of all is the effort of communicating the Message of Allah to an unjust ruler. Similarly, if a society is so much given to a vice that no one can dare to utter a word against it, then to protest against it can also be reckoned as the best Jihad.

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