Read Jude 1:6 on Bible Gateway →
““And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day.”
“Into that He cast the rebel angels, who (though by a license they are now allowed to walk the earth) do carry a hell within their bosoms, and are by and by to be bound with chains, reserved in blackness and darkness forever, for them that kept not their first estate, but lifted the arm of their rebellion against God.”