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Shiavault - a Vault of Shia Islamic Books Mikyalul Makarim Fee Fawaaid ad-Duaa Lil Qai’m vol. 2 25-26: Performing Hajj On Behalf Of Imam (aj) Or Sending Someone as a Proxy For Imam (aj) This is customary among the Shias from the past centuries. Many traditions have clearly stated the recommended nature of these good deeds. Also the traditions that speak of doing good to a believer, also apply in such a case and support this custom.
Scholars have recorded numerous traditions that praise the performance of good deeds on behalf of believers. A couple of such traditions are presented below: Ibne Miskan narrates from Imam Sadiq (as) in the book of Al-Kafi that he asked Imam (as): How much reward is earned by a person who performs a Hajj on behalf of someone else?
Imam (as) replied, “The reward of ten Hajjs shall be given to the one who performs it on behalf of someone else.”[^1] Shaykh Sadooq (a.r.) writes in his book, Man La Yahzarul Faqih that Imam Sadiq (as) was asked regarding the person who performs Hajj on behalf of others. Would be earn any rewards? Imam (as) said, “One who performs Hajj on behalf of someone else gets rewarded for 10 Hajjs.
(Also), the person (who has performed the Hajj on behalf of someone) his mother, father, sons and daughters, brothers and sisters, paternal uncles and aunts and maternal uncles and aunts, all of them receive salvation.
The Mercy of Allah is spread wide and He is kind.”[^2] In Kafi it is narrated through the author’s own chain of narrators from Abu Baseer that Imam Ja’far Sadiq (as) said: One who performs a Hajj on behalf of his relatives as a good turn to them, his Hajj will be perfect, and one on whose behalf he performed the Hajj will get an equal reward, Allah, the Mighty and Sublime is One Who expands that reward.
[^3] I say: The above two traditional reports and some other traditions that we have not quoted for the sake of brevity, prove that it is recommended to perform Hajj on behalf of other believers whether dead or alive, especially if they are relatives. Thus proxy Hajj on behalf of our master (aj) is more meritorious and its reward is higher, because the status of His Eminence (aj) is much higher than other believers and his reward is more than all others.
Also in support of this is the tradition that says that kindness to the relatives of the Holy Prophet (S) is more important than kindness to anyone else.