'Four' in the Bible

Now four men who had a skin disease were [at] the entrance of the gate, and they said {to each other}, "Why [are] we sitting here until we die?

Jehoash king of Israel captured Amaziah king of Judah, the son of Jehoash, the son of Ahaziah, at Beth-Shemesh. Then they came [to] Jerusalem, and he broke down the wall of Jerusalem from the Gate of Ephraim up to the Corner Gate, four hundred cubits!