'Themselves' in the Bible

They are terrible and dreadful: their judgment and their dignity shall proceed of themselves.

Their horses also are swifter than the leopards, and are more fierce than the evening wolves: and their horsemen shall spread themselves, and their horsemen shall come from far; they shall fly as the eagle that hasteth to eat.

Behold, is it not of the LORD of hosts that the people shall labour in the very fire, and the people shall weary themselves for very vanity?