'Themselves' in the Bible

I know thy works, and thy toil and patience, and that thou canst not bear evil men, and didst try them that call themselves apostles, and they are not, and didst find them false;

And the kings of the earth, and the princes, and the chief captains, and the rich, and the strong, and every bondman and freeman, hid themselves in the caves and in the rocks of the mountains;

And the seven angels that had the seven trumpets prepared themselves to sound.