This greek text is from one of the old bible
Translation: At that time the sign of the Son of Man will appear in heaven; and then shall all the tribes of the earth mourn (smite the breast) and they shall see the Son of Man coming upon the clouds of the heaven, with power and much glory . Matthew 24:30
Annual people are smiting the breast(slow hit to your chest) in arbaeen (one of the public Religious gatherings that people come from all over the world) and they help together in the way and you see only kindness. Son of man(imam mahdi) will come with jesus christ (son of god in the bible) and they spread justice all over the world .
You can be helper or lover them if you like spreading justice and destroying injustice for ever.

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Who is imam Mahdi ?

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Who is twelfth imam ?

who is son of man ?