12 as you look forward to the day of God and speed its coming.a That day will bring about the destruction of the heavens by fire, and the elements will melt in the heat.

Read 2 Peter 3:12 Using Other Translations

Looking for and hasting unto the coming of the day of God, wherein the heavens being on fire shall be dissolved, and the elements shall melt with fervent heat?
waiting for and hastening the coming of the day of God, because of which the heavens will be set on fire and dissolved, and the heavenly bodies will melt as they burn!
looking forward to the day of God and hurrying it along. On that day, he will set the heavens on fire, and the elements will melt away in the flames.