Jude 1:6-7

6Also remember that some angels refused to obey God. They took more authority for themselves than God had given them. They left their own proper place with God in heaven. So God has tied them up as prisoners for ever in a completely dark place. He will keep them there until that great day when he will judge everyone.

7Also, remember what happened to the cities called Sodom and Gomorrah, and the other cities that were near them. Like those bad angels, the people who lived in those places were also doing evil things. They were having sex with people who were not their husbands or their wives. They liked to have sex in other ways that are not right. God destroyed their cities. He has punished them with fire that never stops burning. That is an example of what will happen to wicked people like them.