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Imam Sadiq [a] said: "He who is not able to do any good unto us (Ahlul-Bayt) then may he do good to our pious adherents; and he who is not able to visit us, he may visit our righteous followers by which the reward of visiting us (pilgrimage) will be recorded for him."
Bihar-ul-Anwar, vol. 74, p. 354
Source: http://www.al-islam.org/flowers/11.htm
