Authentic hadiths of the Angels visiting and crying over the grave of Imam al-Hussain (as)
Hadith #1: Imam Sadiq (a.s.) asked: What’s wrong with you? Why don’t you go to him (to the grave of Imam Husain)? Because four thousand angels are present at his grave and they cry on him until Judgment Day.
Hadith #13: Imam Sadiq (a.s.) said: Allah has appointed four thousand disheveled angles, covered with dust, at the grave of Imam Husain (a.s.) to cry on him from sunrise to midday. At midday they are replaced with another four thousand who cry over him till sunrise.
Source: Kaamil al-Ziyaaraat, Chapter 27 (See First Image below)
Gradings: al-Mohsini says they are reliable hadiths [Mu`jim al-Ahaadeeth al-Mu`tabarra, Volume 2, Page 227] (See Second Image below)