In these centers Islam facts and Allah's ordinances are circulated.

In these centers Islam facts and Allah's ordinances are circulated. In this extensive and comprehensive meaning, mosques are the houses of prophets and saints; especially the house of the Prophet (p.b.u.h.) and the house of AM (a.s.) are included. There is no reason for the matter that some commentators in their commentaries have limited it only to the mosque or houses of prophets and such like.

And there are some narrations in which its clear extensions are mentioned: Imam Baqir (a.s.) said: "This verse refers to the houses of prophets and the house of Imam Ali (a.s.) is included in it, too."[^1] Another tradition indicates that when The Prophet (p.b.u.h.) was reciting this verse he was asked: "What is the purpose of/buyut/ (houses)?" The Prophet said: "The houses of prophets" Again Abibakr asked: "Is this house (pointing to the house of Fatimah (a.s.) and Ali (a.s.)) included in it, too?

The Prophet said: "Yes, it is the best of them."[^2]All of these denote the clear examples. In another tradition upon the commentary of this verse by Imam Sadiq (a.s.), recorded in the book Raudah Kafi, he has said: "Verily Mishkat is the heart of Muhammad (p.b.u.h.), and Misbah is the very light of knowledge (and guidance), and Zujajah is the heart of Ali (a.s.) or his self, (in which Misbah was placed after departure of the Prophet (p.b.u.h.))."[^3] Also in the book TauHud, by Saduq, we read a tradition by Imam Baqir (a.s.) who said: "Verily Mishkat is the light of knowledge in the heart of the Prophet (p.b.u.h.) and Zujajah is the heart of Ali (a.s.)....

And /Nurun 'ala Nur/ is Imams who are from the family of the Prophet (p.b.u.h.) and they come one after the other. These Imams are assisted by the light of knowledge and wisdom. And this trend has been since the creation of Adam and will continue to the end of the world. [^1] Nur-uth-Thaqalyn, Vol. 3, p. 607 [^2] Majma' ul-Bayan, following the verse [^3] Nur-uth-Thaqalyn, Vol. 3, p. 602 & 603 These are the very testamentary guardians who are appointed as caliphs by Allah in the earth.

There is not and there will be not any age or time that the earth can be empty of one of them.