'Fire' in the Bible

Now by that same word, the present heavens and earth have been reserved for fire and are being kept for the day when ungodly people will be judged and destroyed.

But the Day of the Lord will come like a thief. On that day the heavens will disappear with a roaring sound, the elements will be destroyed by fire, and the earth and everything done on it will be exposed.

as you look forward to and hasten the coming of the day of God, when the heavens will be set ablaze and dissolved and the elements will melt with fire.