'Bonds' in the Bible

Now He was [already] commanding the unclean spirit to come out of the man. For it had seized him [violently] many times; and he was kept under guard and bound with chains and shackles, but he would break the bonds and be driven by the demon into the desert.

And angels who did not keep their own designated place of power, but abandoned their proper dwelling place, [these] He has kept in eternal chains under [the thick gloom of utter] darkness for the judgment of the great day,