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Imam Reza (P.B.U.H) The eight leader of Islam after the Prophet Muhammad (P.B.U.H) said:
Imam is trustee of god on the earth and among God's people, and his proof for the servants and his successor in the cities and summoner towards him and protector of divine sanctuaries.

brief description
in this tradition, which is a part of a long tradition in respect to introduction of imamate position, it is referred to five parts of heavy and important duties of imam.
1- imam is a treasurer and trustee of revelation and protector of all sciences, commands and knowledges of religion.
2- imam is an alive reason and obvious proof and introducer of divine religion.
3- imam is a divine supervisor and authority and his representative among people.
4- imam is one who, bids to goodness and forbids of badness and greatest emissary of religion.
5- imam is a protector of sanctuary of divine

قال علی بن موسی الرضا علیه اسلام
اَلاِْمامُ أَمينُ اللّهِ فِى أَرْضِهِ وَ خَلْقِهِ وَ حُجَّتُهُ عَلَى عِبادِهِ وَ خَلِيفَتُهُ فى بَِلادِهِ وَ الدّاعِى اِلَى اللّهِ وَ الذابُّ عَنْ حَرِيمِ اللّهِ
امام امین خدا در زمین است، و حجتش بر بندگانش، و خلیفه ی او در شهرهایش، و دعوت کننده به سوی خدا و مدافع حریمش
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