'Themselves' in the Bible

I know thy works and thy labour, and thine endurance, and that thou canst not bear evil men; and thou hast tried them who say that themselves are apostles and are not, and hast found them liars;

I know thy tribulation and thy poverty; but thou art rich; and the railing of those who say that they themselves are Jews, and are not, but a synagogue of Satan.

And the kings of the earth, and the great, and the chiliarchs, 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 who had the seven trumpets prepared themselves that they might sound with their trumpets.

But to the fearful and unbelieving, and sinners, and those who make themselves abominable, and murderers, and fornicators, and sorcerers, and idolaters, and all liars, their part is in the lake which burns with fire and brimstone; which is the second death.