'Four' in the Bible

Now there were four lepers seated at the doorway into the town: and they said to one another, Why are we waiting here for death?

And Jehoash, king of Israel, made Amaziah, king of Judah, the son of Jehoash, son of Ahaziah, prisoner at Beth-shemesh, and came to Jerusalem, and had the wall of Jerusalem pulled down from the doorway of Ephraim to the door in the angle, four hundred cubits.