This is taken from Islamic Government by Imam Khomeini which was a series of lectures by him recorded in a form of a book.
It is our duty to preserve Islam. This duty is one of the most important obligations incumbent upon us; it is more necessary even than prayer and fasting. It is for the sake of fulfilling this duty that blood must sometimes be shed. There is no blood more precious than that of Imām Husayn (‘a), yet it was shed for the sake of Islam, because of the precious nature of Islam. We must understand this matter well and convey it to others. You can be the true successors to the Prophet (s) as the guardians of Islam only if you teach Islam to the people; do not say, “We will wait until the coming of the Imām of the Age (‘a).” Would you consider postponing your prayer until the coming of the Imām? The preservation of Islam is even more important than prayer. Do not follow the logic of the governor of Khumayn49 who used to say, “We must promote sin so that the Imām of the Age (‘a) will come. If sin does not prevail, he will not manifest himself!”50
It is our duty to preserve Islam. This duty is one of the most important obligations incumbent upon us; it is more necessary even than prayer and fasting. It is for the sake of fulfilling this duty that blood must sometimes be shed. There is no blood more precious than that of Imām Husayn (‘a), yet it was shed for the sake of Islam, because of the precious nature of Islam. We must understand this matter well and convey it to others. You can be the true successors to the Prophet (s) as the guardians of Islam only if you teach Islam to the people; do not say, “We will wait until the coming of the Imām of the Age (‘a).” Would you consider postponing your prayer until the coming of the Imām? The preservation of Islam is even more important than prayer. Do not follow the logic of the governor of Khumayn49 who used to say, “We must promote sin so that the Imām of the Age (‘a) will come. If sin does not prevail, he will not manifest himself!”50
