Imam Sadiq (a.s.), There are 4,000 angels at the holy shrine of Imam Husain (a.s.). Their heads are covered with dust and they are wailing and will continue to do so till the Day of Judgment. Their leader is called 'Mansoor'. When a person comes to visit Imam's (a.s.) shrine, all these angels welcome him. Kafi, vol 4, pg 581
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