The son of the honest and the nobles will come

Imam Mahdi will stand between Rukn and Maqam next to the Ka'ba clearly making reference to Karbala in the beginning of his movement:

O people of the world, I am the uprising Imam. O people of the world, I am the avenger. O people of the world, my grandfather Husayn was killed while he was thirsty. O people of the world, my grandfather was left without dress. O people of the world, they damaged the body of my grandfather.

Also, Imam Husayn said to Imam Sajjad:

By Allah, my blood will keep boiling until Allah sends the Mahdi and kills seventy thousand of those disbelievers who are transgressors and hypocrites.