And from among you there should be a party who invite to good and enjoin what is right and forbid the wrong, and these it is that shall be successful. 'Al-i-'lmran, No. 3, verse 104
The Holy Prophet (S) said: "The time when my Ummah (Muslim followers) merely count on others to enjoin right and forbid wrong, in fact, they have declared a fight against Allah, the Exalted."
Bihar-ul-Anwar, vol. 100, p. 92
Imam Amir ul Mu'mineen ‘Ali (‘a) said: "He who abandons forbidding what is wrong theoretically and practically (and is indifferent while seeing vices committed) is a moving corpse amongst the living."
Bihar-ul-Anwar, vol. 100, p. 94
The Holy Prophet (S) said: "To prevent a Muslim from doing an unlawful action is equivalent with Allah to the performance of seventy accepted Hajj."
Mustadrak Al-Wasa'il-ush-Shia'h, vol. 11, p. 278
Imam Amir ul Mu'mineen ‘Ali (‘a) said: "Ask others to do good; you will thus be among the good doers. Desist others from evil with your action as well as your speech, and stay away, to the best of your ability, from he who commits it. Struggle for Allah as is His due; and the reviling of a reviler should not deter you in matters of Allah. Leap into danger for the sake of right wherever it may be."
Nahjul Balagha, p. 392 letter 31
Imam al-Baqir (‘a) said: "Verily, enjoining what is right and forbidding what is wrong is the way of prophets and the method of good doers. It is such a great obligatory deed (wajib) by which other obligatory deeds can survive, other creeds can be saved, bargains are lawful, injustices are warded off, and prosperity can fill the earth..."
Al-Kafi, vol. 5, p. 56
Imam Amir ul Mu'mineen ‘Ali (‘a) said: "The firmness of the religion is due to enjoining what is good and forbidding what is wrong, and observing the limits of Allah.
Ghurar-ul-Hikam, p. 236
The Holy Prophet (S) said: "The one who sees a wrong action done should prohibit it by his deed, if he is capable, of course; and if he cannot do that, he should prohibit it by his tongue, but if he is not able to do even that, he may forbid it by his heart."
Wasa'il-ush-Shi'ah, vol. 16, p. 135
The Holy Prophet (S) said: "He who enjoins right and prohibits wrong is the vicegerent of both Allah and His Messenger on the earth."
Mustadrak-ul-Wasa'il, vol. 12, p. 179
The Holy Prophet (S) said: " Whensoever my Ummah undertake to enjoin right and prohibit evil and associate in establishing benevolence, they live happily and prosperously; but when they stop doing so, the blessings will be taken off from them."
At-Tahthib, vol. 6, p. 181
Imam Amir ul Mu'mineen ‘Ali (‘a) said to Imam al-Hasan and Imam al-Husayn (‘a) when Ibn Muljam (the curse of Allah be upon him) struck him (fatally with a sword): "... Fear Allah (and again) fear Allah in the matter of Jihad, (struggle for the Holy War), with the help of your property, lives and speech in the way of Allah..."
"Do not give up bidding for good and forbidding from evil lest the mischievous gain positions over you, and then (in that case) when you pray, your invocations will not be granted to you.
Nahjul Balagha, Letter 47, p. 422
Imam Amir ul Mu'mineen ‘Ali (‘a) said: "Enjoining good is the most excellent deed of people."
Mustadrak-ul-Wasa'il, vol. 12, p.185
Imam as-Sadiq (‘a) said: "All good deeds totally, including even the struggle in the Holy War in the way of Allah, comparing with enjoining right and forbidding wrong, is like a small amount of saliva compared with a deep ocean.
Bihar-ul-Anwar, vol. 100, p. 89
Imam al-Baqir, the fifth Imam, (‘a) said: " Allah, Almighty and Glorious, revealed to Prophet Jethro (Shu'ayb) (‘a): 'I will punish one hundred thousand people of your folk. Forty thousand people are from their vicious ones but sixty thousand of them are from their good-doers. Jethro (‘a) inquired: 'These are the vicious (who deserve punishment), but what about the good-doers?' Then, Allah, Almighty and Glorious, revealed to him: 'They (the good-doers) associated with the sinners and did not become angry because of My wrath."
Al-Kafi, vol. 5, p. 56
Imam Amir-ul-Mu'mineen ‘Ali (‘a) said: "Ask others to do good and forbid evil and do know that 'enjoining right and forbidding wrong' never draws death near nor ceases sustenance."
Wasa'il-ush-Shi'ah, vol. 16, p. 120
Imam as-Sadiq (‘a) said: "Woe to the people who do not support the religion of Allah by enjoining good and forbidding evil."
Mustadrak Al-Wasa'il-ush-Shi'ah, vol. 12, p. 181