'Four' in the Bible

And there were four leprous men at the entrance of the gate, and they said one to another, Why do we abide here until we die?

And Jehoash king of Israel took Amaziah king of Judah, the son of Jehoash son of Ahaziah, at Beth-shemesh, and came to Jerusalem, and broke down the wall of Jerusalem from the gate of Ephraim to the corner-gate, four hundred cubits.